For each of the given pairs of compounds, the compound liberating most heat upon hydrogenations should be identified. Concept introduction: The heat liberation in a reaction is depends upon the stability of the reactant compounds. If the reactant compound is more stable, then the heat liberation will be less. Based on the proximity of C = C bonds in dienes, they are classified into three. Cumulated dienes: the C = C bonds are located adjacent carbons. Conjugated dienes: the C = C bonds or C = C and C = O are separated by one σ-bond. Isolated dienes: the C = C bonds are separated by two or more σ-bonds. The conjugated dienes are more stable as compare to isolated dienes because the delocalization of π bonds is taking place, so this forms some stabilization energy in conjugated system. To identify: the compound liberating most heat upon hydrogenations from the given pairs of compounds.

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Chapter 17, Problem 63IP

(a)

Interpretation Introduction

Interpretation:

For each of the given pairs of compounds, the compound liberating most heat upon hydrogenations should be identified.

Concept introduction:

The heat liberation in a reaction is depends upon the stability of the reactant compounds. If the reactant compound is more stable, then the heat liberation will be less.

Based on the proximity of C = C bonds in dienes, they are classified into three.
Cumulated dienes: the C = C bonds are located adjacent carbons.

Conjugated dienes: the C = C bonds or C = C and C = O are separated by one σ-bond.

Isolated dienes: the C = C bonds are separated by two or more σ-bonds.

The conjugated dienes are more stable as compare to isolated dienes because the delocalization of π bonds is taking place, so this forms some stabilization energy in conjugated system.

To identify: the compound liberating most heat upon hydrogenations from the given pairs of compounds.

(b)

Interpretation Introduction

Interpretation:

For each of the given pairs of compounds, the compound liberating most heat upon hydrogenations should be identified.

Concept introduction:

The heat liberation in a reaction is depends upon the stability of the reactant compounds. If the reactant compound is more stable, then the heat liberation will be less.

Based on the proximity of C = C bonds in dienes, they are classified into three.
Cumulated dienes: the C = C bonds are located adjacent carbons.

Conjugated dienes: the C = C bonds or C = C and C = O are separated by one σ-bond.

Isolated dienes: the C = C bonds are separated by two or more σ-bonds.

The conjugated dienes are more stable as compare to isolated dienes because the delocalization of π bonds is taking place, so this forms some stabilization energy in conjugated system.

To identify: the compound liberating most heat upon hydrogenations from the given pairs of compounds.

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