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Question

The correct order of heat of combustion for following alkadienes is :

A
(C) < (B) < (A)
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B
(B) < (C) < (A)
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C
(A) < (B) < (C)
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D
(A) < (C) < (B)
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Solution

The correct option is C (A) < (B) < (C)
In isomers of hydrocarbon, heat of combution is inversely proportional to the stability.

Trans alkene are more stable than cis alkene due to less steric repulsion.
Hence,
Stability order : A > B > C
Order of heat of combustion : A < B < C

Hence, option (a) is correct.

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