Which one of the following has the smaller heat of hydrogenation per mol?

1-butene

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Trans-2-butene

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Cis-2-butene

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1,3-butadiene

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Solution

The correct option is D 1,3-butadiene
More stable the alkene, lesser is heat of hydrogenation per mol of double bond. 1.3-butadiene is resonance stabilized.

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