Which of the following undergoes S_N1 reactio | vedclass

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Question

(B) The rate of $S_N1$ reaction depends on the stability of the carbocation intermediate formed in the rate-determining step.In option $(B)$,the carbo

Vedclass · Accepted Answer

$CH_3-O-CH(Br)-CH_3$

Vedclass · Answer

(B) The rate of $S_N1$ reaction depends on the stability of the carbocation intermediate formed in the rate-determining step.In option $(B)$,the carbocation formed is $CH_3-O-C^+H-CH_3$.This carbocation is highly stabilized by the resonance effect ($+R$ effect) of the lone pair of electrons on the oxygen atom,which is much stronger than the stabilization provided by the phenyl ring in the benzylic carbocation or the inductive effect in the tertiary carbocation.Therefore,$CH_3-O-CH(Br)-CH_3$ reacts at the fastest rate.

Which of the following undergoes $S_N1$ reaction at the fastest rate?

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(Given: Structure $I$ and $II$ are rigid)

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