(a) Interpretation: The electron-rich sites and electron-poor sites in the given elementary steps are to be identified. Concept introduction: An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

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Answer 1

Question

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

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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 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

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Answer 3

Question

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

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Answer 4

Question

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

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Answer 5

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

Answer 6

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Answer 7

Chapter 7, Problem 7.50P

Interpretation Introduction

(a)

Interpretation:

The electron-rich sites and electron-poor sites in the given elementary steps are to be identified.

Concept introduction:

An atom with partial or full negative charge is an electron-rich site whereas an atom with partial or full positive charge is an electron-poor site. In an elementary step, electrons tend to flow from an electron-rich site to an electron-poor site.

Answer 8

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Answer 9

Interpretation Introduction

(b)

Interpretation:

In each of the given elementary steps the appropriate curved arrows are to be drawn.

Concept introduction:

The curved arrow is drawn from electron rich site to an electron poor site to show the flow of electrons from electron-rich site to electron-poor site. The first curved arrow is drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow is drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

Answer 10

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

Answer 11

Interpretation Introduction

(c)

Interpretation:

The names of each elementary step are to be identified.

Concept introduction:

In the bimolecular substitution reaction SN2, electron pair from the electron-rich site approaches the carbon atom of substrate to which the electron-poor atom is attached. As the anion (nucleophile) forms a bond with this carbon atom, the bond between the carbon atom and the electron-poor atom breaks. The making and breaking of bonds takes place simultaneously.

An elementary step in which a proton is transferred from electron-poor site to electron- rich site and one bond is broken and another is formed simultaneously is called proton transfer step.

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 7 - Prob. 7.1P Ch. 7 - Prob. 7.2P Ch. 7 - Prob. 7.3P Ch. 7 - Prob. 7.4P Ch. 7 - Prob. 7.5P Ch. 7 - Prob. 7.6P Ch. 7 - Prob. 7.7P Ch. 7 - Prob. 7.8P Ch. 7 - Prob. 7.9P Ch. 7 - Prob. 7.10P

Solution Summary: The author explains that electrons flow from an electron-rich site to a negative-charged atom. The curved arrows are drawn from electron rich to electron poor sites.

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