Which one of the following halogen compounds | vedclass

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(D) The reactivity of alkyl halides towards the $S_{N}1$ mechanism depends on the stability of the carbocation intermediate formed during the rate-det

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Ethyl chloride

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(D) The reactivity of alkyl halides towards the $S_{N}1$ mechanism depends on the stability of the carbocation intermediate formed during the rate-determining step.Stability order of carbocations: $3^{\circ} > 2^{\circ} > 1^{\circ}$.$1$. Tertiary butyl chloride ($CH_3)_3CCl$ forms a $3^{\circ}$ carbocation,which is highly stable.$2$. Isopropyl chloride $(CH_3)_2CHCl$ forms a $2^{\circ}$ carbocation.$3$. Allyl chloride $CH_2=CH-CH_2Cl$ forms an allyl carbocation,which is resonance stabilized.$4$. Ethyl chloride $CH_3CH_2Cl$ forms a $1^{\circ}$ carbocation,which is the least stable among the given options.Therefore,ethyl chloride is the least reactive towards the $S_{N}1$ mechanism.

Which one of the following halogen compounds is least reactive towards hydrolysis by $S_{N}1$ mechanism?

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