ORG CHEM CONNECT CARD
ORG CHEM CONNECT CARD
6th Edition
ISBN: 9781264860746
Author: SMITH
Publisher: MCG
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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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