(a) Interpretation: All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given. Concept introduction: The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

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Answer 1

Question

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

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Assign this HSQC Spectrum ( please editing clearly on the image)

(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

Answer 2

Question

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

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Answer 3

Question

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

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Answer 4

Question

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

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Answer 5

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 6

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 7

Chapter 23, Problem 23.2YT

Interpretation Introduction

(a)

Interpretation:

All lone pairs to the atom at the point of attachment for every substituent in Table 23-1 are to be added. Also, out of the two columns, the column (ortho/para- or meta directing substituents) in which these substituents can be found is to be given.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 8

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 9

Interpretation Introduction

(b)

Interpretation:

The substituent in the column attached by an atom that has no lone pairs of electrons is to be shown. Also any electronegative atoms at or near the point of attachment are to be shown.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 10

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 11

Interpretation Introduction

(c)

Interpretation:

In the other column, electronegative atoms at or near the point of attachment are to be found.

Concept introduction:

The substituent on the benzene ring prior to substitution dictates the regiochemistry of the reaction. Some substituents are designated as ortho/para directors because they lead to product mixtures consisting primarily of the ortho- and para-disubstituted products. Other substituents are designated as meta directors because they favor the formation of the meta-disubstituted product. The results from nitration reactions are summarized in Table 23-1:

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 23 - Prob. 23.1P Ch. 23 - Prob. 23.2P Ch. 23 - Prob. 23.3P Ch. 23 - Prob. 23.4P Ch. 23 - Prob. 23.5P Ch. 23 - Prob. 23.6P Ch. 23 - Prob. 23.7P Ch. 23 - Prob. 23.8P Ch. 23 - Prob. 23.9P Ch. 23 - Prob. 23.10P

Solution Summary: The author explains that all lone pairs are added to the atom at the point of attachment for every substituent in Table 23-1.

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