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(D) The rate of $S_{N^1}$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining step.$S_{N^1}$ reaction

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$2-$Bromo$-2-$methylbutane

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(D) The rate of $S_{N^1}$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining step.$S_{N^1}$ reaction follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ}$ carbocation stability.$(A)$ $1-$Bromopentane is a $1^{\circ}$ alkyl halide.$(B)$ $1-$Bromo$-2-$methylbutane is a $1^{\circ}$ alkyl halide.$(C)$ $2-$Bromopentane is a $2^{\circ}$ alkyl halide.$(D)$ $2-$Bromo$-2-$methylbutane is a $3^{\circ}$ alkyl halide.Since $3^{\circ}$ carbocations are the most stable due to inductive effect and hyperconjugation,$2-$Bromo$-2-$methylbutane will form the most stable carbocation and undergo $S_{N^1}$ reaction most easily.

Which of the following compounds will undergo $S_{N^1}$ reaction most easily?

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