(a) Interpretation: The given molecule is chiral or not is to be identified. Concept introduction: The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents. Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

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Answer 1

Question

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

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(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

fcrip = ↓ bandwidth Il temp 32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual components of the van Deemter equation and consequently, band broadening? Increase temperature Longer column Using a gas mobile phase instead of liquid Smaller particle stationary phase Multiple Paths Diffusion Mass Transfer

34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10

Answer 2

Question

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

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Answer 3

Question

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

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Answer 4

Question

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

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Answer 5

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 6

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 7

Chapter 5, Problem 5.40P

Interpretation Introduction

(a)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 10

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 11

Interpretation Introduction

(c)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 12

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 13

Interpretation Introduction

(d)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 14

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 15

Interpretation Introduction

(e)

Interpretation:

The given molecule is chiral or not is to be identified.

Concept introduction:

The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Answer 16

Expert Solution & Answer

Answer 17

Expert Solution & Answer

Answer 18

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Answer 19

Ch. 5 - Prob. 5.1P Ch. 5 - Prob. 5.2P Ch. 5 - Prob. 5.3P Ch. 5 - Prob. 5.4P Ch. 5 - Prob. 5.5P Ch. 5 - Prob. 5.6P Ch. 5 - Prob. 5.7P Ch. 5 - Prob. 5.8P Ch. 5 - Prob. 5.9P Ch. 5 - Prob. 5.10P

Solution Summary: The author explains that the absence of chiral centers does not guarantee that a molecule is achiral. Allenes are cumulated dienes in which one carbon atom is attached with each of its two neighbouring

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Chapter 5 Solutions