Claisen Condensation for Beta-Keto Acid Synthesis

Steps:

• X, ethyl acetate (CH₃COOCH₂CH₃), undergoes base-catalyzed Claisen condensation with another molecule of itself to form Y, ethyl 3-oxobutanoate (CH₃COCH₂COOCH₂CH₃).
• Y undergoes acid hydrolysis to yield 3-oxobutanoic acid (CH₃COCH₂COOH), the beta-keto acid product.
• The reaction sequence relies on the enolate formation from the alpha-hydrogen of ethyl acetate, followed by nucleophilic attack on the carbonyl.
• Mild hydrolysis conditions prevent decarboxylation, isolating the target acid.

Why A is correct:

• A depicts ethyl acetate, the standard self-condensing ester in Claisen reaction to generate the required beta-keto ester intermediate per organic synthesis principles.

Why the others are wrong:

• B (acetone) lacks ester functionality for Claisen condensation and cannot form the beta-keto ester.
• C (ethanol) is an alcohol, not a carbonyl compound suitable for enolate formation or condensation.
• D (acetic acid) is a carboxylic acid that does not undergo Claisen under basic conditions without esterification first.

Final answer: A