(a) Interpretation: An orbital symmetry analysis for showing the suprafacial [ 1 , 5 ] carbon migrations that should occur with retention of configuration in the migrating group is to be stated. Concept introduction: The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π − system to another region takes place simultaneously.

Question

Electrochemical cell potentials can be used to determine equilibrium constants that would be otherwise difficult to determine because concentrations are small. What is Κ for the following balanced reaction if E˚ = +0.0218 V? 3 Zn(s) + 2 Cr3+(aq) → 3 Zn2+(aq) + Cr(s) E˚ = +0.0218 V

Answer 1

Question

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

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Electrochemical cell potentials can be used to determine equilibrium constants that would be otherwise difficult to determine because concentrations are small. What is Κ for the following balanced reaction if E˚ = +0.0218 V? 3 Zn(s) + 2 Cr3+(aq) → 3 Zn2+(aq) + Cr(s) E˚ = +0.0218 V

Consider the following half-reactions: Hg2+(aq) + 2e– → Hg(l) E°red = +0.854 V Cu2+(aq) + 2e– → Cu(s)E°red = +0.337 V Ni2+(aq) + 2e– → Ni(s) E°red = -0.250 V Fe2+(aq) + 2e– → Fe(s) E°red = -0.440 V Zn2+(aq) + 2e– → Zn(s) E°red = -0.763 V What is the best oxidizing agent shown above (i.e., the substance that is most likely to be reduced)?

Calculate the equilibrium constant, K, for MnO2(s) + 4 H+(aq) + Zn(s) → Mn2+(aq) + 2 H2O(l) + Zn2+(aq)

Answer 2

Question

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

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Answer 3

Question

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

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Answer 4

Question

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

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Answer 5

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Answer 6

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Answer 7

Chapter 28, Problem 28.18P

Interpretation Introduction

(a)

Interpretation:

An orbital symmetry analysis for showing the suprafacial [1,5] carbon migrations that should occur with retention of configuration in the migrating group is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The type of sigmatropic reactions that is involved in the given reactions is to be stated. Whether the stereochemistry of the first step is according to the predictions of orbital symmetry or not is to be stated.

Concept introduction:

The pericyclic reactions in which one sigma bond is converted to another sigma bond within the uncatalyzed intramolecular reaction are known as sigmatropic reactions. In this rearrangement, the shifting of one substituent from one region of a π− system to another region takes place simultaneously.

Answer 10

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Answer 21

Ch. 28 - Prob. 28.1P Ch. 28 - Prob. 28.2P Ch. 28 - Prob. 28.3P Ch. 28 - Prob. 28.4P Ch. 28 - Prob. 28.5P Ch. 28 - Prob. 28.6P Ch. 28 - Prob. 28.7P Ch. 28 - Prob. 28.8P Ch. 28 - Prob. 28.9P Ch. 28 - Prob. 28.10P

Solution Summary: The author explains how the pericyclic reactions are known as sigmatropic reactions. The HOMO and LUMO of the migrating carbon cation involve in the bonding interaction which is suprafacial

Chapter 28 Solutions