Which of the following compound would undergo SN1 reaction faster and why?

(C₆H₅)CH₂Cl. Or. (C₆H₁₁)CH₂Cl

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Solution

In SN¹ ,reaction proceeds in two steps.First step involves slow separation of halogen to form carbonium ion. Second step involves attack of nucleophile on carbonium ion from both sides to form alcohol.

Any species which is capable of forming stable carbonium ion would prefer to undergo nucleophilic substitution by SN¹.
(C₆H₁₁)CH₂Cl react faster bcz the carbocation made on this is more stable then the other one. in SN1 reaction rate of reaction is proportional to stability of carbocation

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