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Question

The correct order for the increasing heat of hydrogenation for the following structures is :


A
(a)<(b)<(c)
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B
(b)<(c)<(a)
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C
(c)<(b)<(a)
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D
(a)<(c)<(b)
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Solution

The correct option is A (a)<(b)<(c)


(a) has 10 alpha hydrogens.
(b) has 6 alpha hydrogens.
(c) has 3 alpha hydrogens.

More the number of alpha hydrogens more is the stability and lesser is the heat of hydrogenation.
So the correct order of increase in heat of hydrogenation is (a)<(b)<(c)

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