The rate of S_{N}1 reaction for the given com | vedclass

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(A) The rate of $S_{N}1$ reaction is directly proportional to the stability of the carbocation intermediate formed.In the given compounds,the carbocat

Vedclass · Accepted Answer

$A > B > C$

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(A) The rate of $S_{N}1$ reaction is directly proportional to the stability of the carbocation intermediate formed.In the given compounds,the carbocation formed is a substituted benzyl carbocation $(Ar-CH_2^+)$.Compound $(A)$ has a $-OCH_3$ group at the para position,which provides strong $+M$ (mesomeric) effect,greatly stabilizing the carbocation.Compound $(B)$ has a $-CH_3$ group at the para position,which provides $+I$ (inductive) and hyperconjugation effects,stabilizing the carbocation.Compound $(C)$ has a $-NO_2$ group at the para position,which provides a strong $-M$ and $-I$ effect,destabilizing the carbocation.Therefore,the order of stability of the carbocations is $A > B > C$,which is also the order of the rate of $S_{N}1$ reaction.

The rate of $S_{N}1$ reaction for the given compounds is:

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