Under identical conditions, the S_{N}1 reacti | vedclass

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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. $S_{N}1$ reactions

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tert-butyl chloride

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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. $S_{N}1$ reactions proceed via the formation of a carbocation, and the stability order of carbocations is $3^{\circ} > 2^{\circ} > 1^{\circ}$. Therefore, the reactivity order for $S_{N}1$ reactions is $3^{\circ} > 2^{\circ} > 1^{\circ}$ alkyl halides. Among the given options: $A$. tert-butyl chloride is a $3^{\circ}$ alkyl halide. $B$. $1-$chlorobutane is a $1^{\circ}$ alkyl halide. $C$. $2-$methyl$-1-$chloropropane is a $1^{\circ}$ alkyl halide. $D$. $2-$chlorobutane is a $2^{\circ}$ alkyl halide. Since tert-butyl chloride forms the most stable $3^{\circ}$ carbocation, it reacts most efficiently via the $S_{N}1$ mechanism.

Under identical conditions, the $S_{N}1$ reaction will occur most efficiently with

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