(a) Interpretation: Among the given pair of alkenes , the one which has larger heat of hydrogenation is to be identified. Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane . Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

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Answer 1

Question

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

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NMR spectrum of ethyl acetate has signals whose chemical shifts are indicated below. Which hydrogen or set of hydrogens corresponds to the signal at 4.1 ppm? Select the single best answer. The H O HỌC—C—0—CH, CH, 2 A ethyl acetate H NMR: 1.3 ppm, 2.0 ppm, 4.1 ppm Check OA B OC ch B C Save For Later Submit Ass © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center |

How many signals do you expect in the H NMR spectrum for this molecule? Br Br Write the answer below. Also, in each of the drawing areas below is a copy of the molecule, with Hs shown. In each copy, one of the H atoms is colored red. Highlight in red all other H atoms that would contribute to the same signal as the H already highlighted red Note for advanced students: In this question, any multiplet is counted as one signal. 1 Number of signals in the 'H NMR spectrum. For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. Check For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. O ✓ No additional Hs to color in top molecule ง No additional Hs to color in bottom…

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Answer 2

Question

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

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Answer 3

Question

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

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Answer 4

Question

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

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Answer 5

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

Answer 6

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Answer 7

Chapter 12.3, Problem 4P

Interpretation Introduction

(a)

Interpretation: Among the given pair of alkenes, the one which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of an alkene, lower is the heat of hydrogenation. In cis-isomer, the atom or groups attached to a ring are on same side of the ring. In trans-isomer, the atom or groups attached to a ring are on the opposite sides of ring.

Answer 8

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

Answer 9

Interpretation Introduction

(b)

Interpretation: Among the given pair of alkenes, alkene which has larger heat of hydrogenation is to be identified.

Concept introduction: Hydrogenation reaction is exothermic in nature due to the fact that the bonds are stronger in product than in reactant. Heat of hydrogenation can be used as measure for relative stability of alkenes when they are reduced to same alkane. Higher the stability of alkene, lower is the heat of hydrogenation.

Answer 10

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Answer 12

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Answer 13

Ch. 12.1 - Prob. 1P Ch. 12.3 - Problem 12.2 What alkane is formed when each...Ch. 12.3 - Prob. 3P Ch. 12.3 - Prob. 4P Ch. 12.3 - Prob. 5P Ch. 12.3 - Prob. 6P Ch. 12.3 - Compound Molecular formula before...Ch. 12.4 - Problem 12.8 Draw the products formed when...Ch. 12.5 - Prob. 9P Ch. 12.5 - Prob. 10P

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