Bromoethane hydrolyzes faster via nucleophilic substitution Steps:

• Hydrolysis of haloalkanes involves water acting as a nucleophile attacking the carbon-halogen bond.
• For primary alkyl halides like these, the mechanism is SN2 nucleophilic substitution.
• Leaving group ability determines rate: Br⁻ is a better leaving group than Cl⁻ due to its larger size and weaker C-Br bond.
• Thus, bromoethane reacts more rapidly than chloroethane.

Why A is correct:

• Bromoethane undergoes faster SN2 hydrolysis because Br⁻ is a superior leaving group to Cl⁻, as per leaving group trends in nucleophilic substitution.

Why the others are wrong:

• B: Chloroethane hydrolyzes slower due to poorer leaving group (Cl⁻ vs. Br⁻).
• C: Electrophilic substitution applies to aromatic compounds, not alkyl halide hydrolysis.
• D: Same as C; mechanism is nucleophilic, not electrophilic, and chloroethane is slower.

Final answer: A