Which of the following is least reactive towa | vedclass

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(B) The reactivity towards $S_{N}1$ reaction depends on the stability of the carbocation formed in the rate-determining step.In $C_6H_5Cl$,the $C-Cl$

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$C_6H_5Cl$

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(B) The reactivity towards $S_{N}1$ reaction depends on the stability of the carbocation formed in the rate-determining step.In $C_6H_5Cl$,the $C-Cl$ bond has partial double bond character due to resonance,making it extremely difficult to break.Furthermore,the resulting phenyl cation $(C_6H_5^+)$ is highly unstable because the positive charge is on an $sp$-hybridized carbon atom.In contrast,the other options form relatively stable carbocations: $C_6H_5CH_2^+$ (benzyl),$CH_2=CH-CH_2^+$ (allyl),and $(C_6H_5)_2CH^+$ (diphenylmethyl).Therefore,$C_6H_5Cl$ is the least reactive towards $S_{N}1$ reaction.

Which of the following is least reactive towards $S_{N}1$ reaction?

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