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(D) The $S_N2$ reaction rate is primarily governed by steric hindrance and the quality of the leaving group.$1$. $S_N2$ reactions prefer primary subst

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propyl tosylate

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(D) The $S_N2$ reaction rate is primarily governed by steric hindrance and the quality of the leaving group.$1$. $S_N2$ reactions prefer primary substrates over secondary or tertiary ones due to lower steric hindrance.$2$. Tosylate $(-OTs)$ is an excellent leaving group,whereas methoxy $(-OMe)$ is a very poor leaving group and generally does not undergo $S_N2$ substitution.$3$. Comparing the given options:- $A$ and $C$ contain $-OMe$ as a potential leaving group,which is poor.- $B$ is a secondary substrate (cyclopentyl tosylate).- $D$ is a primary substrate (propyl tosylate).$4$. Since $D$ is a primary substrate with an excellent leaving group $(-OTs)$,it will react the fastest in an $S_N2$ reaction.

Which of the following compounds would react faster with $NaCN$ in an $S_N2$ reaction?

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