The reactivity order of the following molecul | vedclass

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(A) The reactivity of alkyl halides towards $S_N1$ reaction depends on the stability of the carbocation formed in the rate-determining step.$1$. Allyl

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$I > III > II$

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(A) The reactivity of alkyl halides towards $S_N1$ reaction depends on the stability of the carbocation formed in the rate-determining step.$1$. Allyl chloride $(I)$ forms an allyl carbocation $(CH_2=CH-CH_2^+)$, which is resonance-stabilized.$2$. Ethyl chloride $(III)$ forms a primary ethyl carbocation $(CH_3-CH_2^+)$, which is less stable than the allyl carbocation.$3$. Chlorobenzene $(II)$ does not undergo $S_N1$ reaction easily because the $C-Cl$ bond has partial double bond character due to resonance, making the formation of a phenyl carbocation extremely difficult.Thus, the order of reactivity is $I > III > II$.

The reactivity order of the following molecules towards $S_N1$ reaction is:
$(I)$ Allyl chloride
$(II)$ Chlorobenzene
$(III)$ Ethyl chloride

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The reactivity order of the following molecules towards $S_N1$ reaction is:$(I)$ Allyl chloride$(II)$ Chlorobenzene$(III)$ Ethyl chloride