Single Choice

$$S_{N}2$$ reaction readily occurs in:

A$$CH_{3}CH_{2}-O-CH_{3}$$
Correct Answer
B$$CH_3 - {\underset{CH_3}{\underset{\!\!\!\!\!|}{\overset{\,CH_3}{\overset{\!|}{C} -}}}}O - CH_3$$
C$$CH_{2}=CH-CH_{2}-O-CH_{3}$$
D$$Ph-CH_{2}-O-CH_{2}-CH_{3}$$

Solution

SN2 reactions occur more readily at carbons that are less substituted. It is easier for the nucleophile to attack if there is little substitution around the C-leaving group bond. Therefore, the order of reactivity for alkyl halides is methyl>primary>secondary>>>tertiary.

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