Which of the following is most reactive towar | vedclass

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(A) $S_{N}1$ reactions proceed via the formation of a carbocation intermediate. The stability of the carbocation determines the reactivity. $PhCH_2Cl$

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$PhCH_2Cl$

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(A) $S_{N}1$ reactions proceed via the formation of a carbocation intermediate. The stability of the carbocation determines the reactivity. $PhCH_2Cl$ forms a resonance-stabilized benzyl carbocation $(Ph-CH_2^+)$. $Ph-Cl$ is an aryl halide and is least reactive towards $S_{N}1$. $CH_3CHClCH_3$ forms a secondary carbocation. $p-NO_2-C_6H_4CH_2Cl$ forms a benzyl carbocation,but the $NO_2$ group is a strong electron-withdrawing group ($-I$ and $-M$ effect),which destabilizes the carbocation. Comparing the stability,the unsubstituted benzyl carbocation $(PhCH_2^+)$ is more stable than the secondary carbocation and significantly more stable than the $NO_2$-substituted benzyl carbocation. Thus,$PhCH_2Cl$ is the most reactive.

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

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