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Question

Which of the following compounds has the most negative heat of hydrogenation?

A
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B
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C
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D
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Solution

The correct option is A
Heat of hydrogenation α 1stability of alkene
Stability of alkene α No. of α Hydrogens
So, the most unstable alkene out of the given compounds is (a).
Hence, the most negative heat of hydrogenation will be observed for alkene (a).

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