Which of the following compounds is most reac | vedclass

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(A) The reactivity of $S_N 1$ reaction is directly proportional to the stability of the carbocation intermediate formed after the departure of the lea

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$3-$bromocyclopent$-1,4-$diene

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(A) The reactivity of $S_N 1$ reaction is directly proportional to the stability of the carbocation intermediate formed after the departure of the leaving group $(Br^-)$.In option $A$,the carbocation formed is the cyclopentadienyl cation,which is aromatic ($6 \pi$ electrons,planar,cyclic,conjugated). Aromatic compounds are exceptionally stable.In option $B$,the carbocation is allylic,which is resonance-stabilized but not aromatic.In option $C$,the carbocation is also allylic but less substituted than $B$.In option $D$,the carbocation is also allylic but with different substitution.Since the cyclopentadienyl cation is aromatic,it is the most stable carbocation among the choices,making the corresponding alkyl bromide the most reactive in an $S_N 1$ reaction.

Which of the following compounds is most reactive in $S_N 1$ reaction?

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