Which of the following has the lowest heat of hydrogenation per mole?

cis-2-Butene

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trans-2-Butene

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1-Butene

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1,3-Butadiene

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Solution

The correct option is D 1,3-Butadiene
1,3-butadiene is more stable as it is conjugated diene. It has the lowest heat of hydrogenation per mole. Higher is the stability of alkene, lower is the heat of hydrogenation per mole.

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