Ester hydrolysis yields carboxylic acid and alcohol Steps:

• Hydrolysis of an ester RCOOR' produces RCOOH and R'OH.
• Ethanoic acid is CH₃COOH, so the acyl group is CH₃C(O)-.
• Butan-2-ol is CH₃CH(OH)CH₂CH₃, so the alkyl group is -CH(CH₃)CH₂CH₃.
• The ester formula is CH₃CO₂CH(CH₃)CH₂CH₃, matching option B.

Why B is correct:

• B is the ester of ethanoic acid and butan-2-ol; by ester hydrolysis definition, it yields CH₃COOH and CH₃CH(OH)CH₂CH₃.

Why the others are wrong:

• A is butan-2-one (ketone); ketones do not undergo hydrolysis to give alcohol and carboxylic acid.
• C is methyl propanoate; hydrolysis gives propanoic acid (CH₃CH₂COOH) and methanol (CH₃OH).
• D is propyl ethanoate; hydrolysis gives ethanoic acid (CH₃COOH) and propan-1-ol (CH₃CH₂CH₂OH).

Final answer: B