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(A) The rate of $S_N 1$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining step.The stability order

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$(i)$ $2$-chloro$-2-$methylpropane and (ii) $2$-chloropentane

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(A) The rate of $S_N 1$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining step.The stability order of carbocations is $3^{\circ} > 2^{\circ} > 1^{\circ}$.In pair $(i)$,$2$-chloro$-2-$methylpropane forms a $3^{\circ}$ carbocation,which is more stable than the $2^{\circ}$ carbocation formed by $2$-chloropentane.In pair (ii),$2$-chloropentane forms a $2^{\circ}$ carbocation,which is more stable than the $1^{\circ}$ carbocation formed by $1$-chloropentane.Therefore,both $2$-chloro$-2-$methylpropane and $2$-chloropentane undergo faster $S_N 1$ reactions compared to their respective counterparts in the given pairs.

In the following pairs of halogen compounds,which compound undergoes faster $S_N 1$ reaction?

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