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(B) The reactivity of alkyl halides towards ${S_N}^1$ reaction is directly proportional to the stability of the carbocation intermediate formed after

Vedclass · Accepted Answer

$II > I > IV > III$

Vedclass · Answer

(B) The reactivity of alkyl halides towards ${S_N}^1$ reaction is directly proportional to the stability of the carbocation intermediate formed after the departure of the leaving group.$1$. In compound $II$,the carbocation formed is stabilized by resonance due to the lone pair of electrons on the oxygen atom ($+M$ effect),making it the most stable.$2$. In compound $I$,the carbocation is tertiary $(3^{\circ})$ and stabilized by $7$ hyperconjugative $\alpha$-hydrogens.$3$. In compound $IV$,the carbocation is secondary $(2^{\circ})$ and stabilized by $4$ hyperconjugative $\alpha$-hydrogens.$4$. In compound $III$,the carbocation is adjacent to a carbonyl group $(C=O)$,which is an electron-withdrawing group ($-I$ effect),making it the least stable.Therefore,the order of stability of carbocations and thus the reactivity towards ${S_N}^1$ is $II > I > IV > III$.

Arrange the following in their correct order of reactivity towards ${S_N}^1$ reaction.

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