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(A) The heat of hydrogenation $(\Delta H_{hyd})$ is directly proportional to the instability of the alkene. More substituted alkenes are generally mor

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Vinylcyclohexane

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(A) The heat of hydrogenation $(\Delta H_{hyd})$ is directly proportional to the instability of the alkene. More substituted alkenes are generally more stable due to hyperconjugation and inductive effects,thus they have a less negative heat of hydrogenation. Comparing the structures:$(A)$ Vinylcyclohexane: Monosubstituted alkene.$(B)$ Methylenecyclohexane: Disubstituted alkene.$(C)$ $1-$Isopropylidenecyclohexane: Tetrasubstituted alkene.$(D)$ $1-$Methylcyclohexene: Disubstituted alkene.Among these,the monosubstituted alkene (Vinylcyclohexane) is the least stable,meaning it has the highest potential energy and therefore releases the most energy upon hydrogenation. Thus,it has the most negative heat of hydrogenation.

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

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