The decreasing order of heat evolved upon cat | vedclass

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Question

(B) The heat of hydrogenation is inversely proportional to the stability of the alkene. More substituted alkenes are more stable and release less heat

Vedclass · Accepted Answer

$d > a > c > b$

Vedclass · Answer

(B) The heat of hydrogenation is inversely proportional to the stability of the alkene. More substituted alkenes are more stable and release less heat upon hydrogenation.Counting the number of $\alpha$-hydrogens for each structure:$(a)$ $3,4$-dimethylcyclohexene: $4\ \alpha-H$$(b)$ $1,2$-dimethylcyclohexene: $8\ \alpha-H$ (most stable)$(c)$ $1,3$-dimethylcyclohexene: $6\ \alpha-H$$(d)$ $1$-methylmethylenecyclohexane: $3\ \alpha-H$ (least stable)Stability order: $(b) > (c) > (a) > (d)$.Therefore,the decreasing order of heat evolved is: $(d) > (a) > (c) > (b)$.

The decreasing order of heat evolved upon catalytic hydrogenation of the given reactants with $H_2\ (Pd/C)$ is:

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