A Levels Chemistry (9701)•9701/13/M/J/19
Explanation
Ester Hydrolysis Yields Carboxylic Acid from Acyl Group
Steps:
- Examine the ester: it has a carbonyl (C=O) bonded to an alkyl group (R) and an alkoxy group (OR').
- Acid hydrolysis cleaves the ester bond, producing RCOOH and R'OH.
- The carboxylic acid structure is RCOOH, retaining the original acyl portion (R-C=O).
- Compare RCOOH to options; select the one matching the ester's R group.
Why A is correct:
- A matches the acyl-derived carboxylic acid per the hydrolysis reaction: RCOOR' + H2O → RCOOH + R'OH.
Why the others are wrong:
- B: Represents the alcohol product, not the acid.
- C: Incorrect alkyl chain length on the acid.
- D: Features a branched structure absent in the ester's acyl group.
Final answer: A
Topic: Carboxylic acids and derivatives
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