Shifana posted an Question
June 12, 2021 • 17:33 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Which has smallest heat of hydrogenation? a)butene b)cis 2butene c)trans 2 butene d)1,3butadiene

which has smallest heat of hydrogenation? a)butene b)cis 2butene c)trans 2 butene d)1,3butadiene

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    Priyanshu kumar best-answer

    1,3-butadiene is most stable so it has smallest HOH. Explanation:- 1,3-Butadiene shows the smallest heat of hydrogenation due to its higher stability which is due to resonance.

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    but we have give priority to number of double bond..ryt??

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    yes, but here 1,3 butadiene is expected to show smallest HOH due to its higher stability due to resonance

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    trans-2-butene is more stable than cis-2- butene and 1-butene is less stable than 2-butene due to hyperconjugation so HOH order should be 1-butene > cis-2-butene > trans-2-butene > 1,3-butadiene

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