Ester naming convention Steps:

• Identify the carboxylic acid: CH3COOH is ethanoic acid, contributing the "ethanoate" part.
• Identify the alcohol: CH3CH2OH is ethanol, contributing the "ethyl" alkyl group.
• Combine as alkyl alkanoate: ethyl from alcohol + ethanoate from acid.
• Verify formula: CH3COOCH2CH3 matches ethyl ethanoate structure.

Why A is correct:

• Follows IUPAC rule: ester name is alkyl (from alcohol) + alkanoate (from acid's carboxylate).

Why the others are wrong:

• B: "Propanoate" implies propanoic acid (C2H5COOH), but acid is ethanoic (CH3COOH).
• C: "Propyl" implies propanol (C3H7OH), but alcohol is ethanol (C2H5OH).
• D: Combines incorrect "propyl" and "propanoate" from wrong acid and alcohol.

Final answer: A