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Question

Arrange the following in the increasing order of their heat of hydrogenation:

  1. P<Q<R<S
  2. S<R<P<Q
  3. S<R<Q<P
  4. P<Q<S<R


Solution

The correct option is A P<Q<R<S
Heat of hydrogenation1stability of alkene

The stability of alkenes depends upon two major factors:
i) Conjugation
ii) Number of αhygrogens

(P) being most stable has least heat of hydrogenation since the double bond is in conjugation.

Among (Q), (R) and (S), the number of αhygrogens are in the order: Q>R>S

Hence, the heat of hydrogenation follows the trend: P<Q<R<S
 

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