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(D) The rate of an $S_N2$ reaction depends primarily on the steric hindrance around the electrophilic carbon atom. Less sterically hindered substrates

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$C_6H_5CH_2Br$

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(D) The rate of an $S_N2$ reaction depends primarily on the steric hindrance around the electrophilic carbon atom. Less sterically hindered substrates react faster in $S_N2$ reactions. The order of reactivity for $S_N2$ is: $	ext{primary} > 	ext{secondary} > 	ext{tertiary}$. In the given options: $A$ is a secondary alkyl halide. $B$ is a secondary alkyl halide (with two bulky phenyl groups). $C$ is a tertiary alkyl halide. $D$ $(C_6H_5CH_2Br)$ is a primary benzylic halide. Since $D$ is a primary halide,it experiences the least steric hindrance,making it the most reactive towards $S_N2$ substitution. Therefore,the correct option is $D$.

Which of the following compounds has the fastest $S_N2$ reaction rate?

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