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(D) The rate of catalytic hydrogenation of alkenes is inversely proportional to their stability.More substituted alkenes are more stable and thus reac

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$d$

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(D) The rate of catalytic hydrogenation of alkenes is inversely proportional to their stability.More substituted alkenes are more stable and thus react more slowly.Comparing the substitution of the double bonds:- Bond $a$: Trisubstituted alkene.- Bond $b$: Trisubstituted alkene.- Bond $c$: Trisubstituted alkene.- Bond $d$: Monosubstituted (terminal) alkene.Since the monosubstituted alkene $(d)$ is the least substituted and therefore the least stable,it will undergo catalytic hydrogenation most readily (first).

Which $\pi$-bond will be reduced first when the compound shown below undergoes catalytic hydrogenation?

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