Question

Which of the following undergoes nucleophilic substitution exclusively by $S{N}^2$ mechanism?

• A. Ethyl chloride
• B. Isopropyl chloride
• C. Chlorobenzene
• D. Benzyl chloride

Answer 1

The correct option is A Ethyl chloride

$S{N}^2$ mechanism is favored by alkyl halides containing less bulky group attached to the halide ion. Among the given alternatives, ethyl chloride is the least bulky group and hence will undergo nucleophilic substitution by $S{N}^2$ mechanism