Smallest heat of hydrogenation per mole, Chemistry

which of the following has smallest heat of hydrogenation per mole

A) 1-Butene                     B)trans-2-butene

C)cis-2-butene                D)1,3-butadiene

Ans)     D)1,3-butadiene because more stable the alkene,lesser the heat of hydrogenation per mole of double bond, 1,3-Butadiene has the most stable double bond due to conjugation.

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