Which of the following compounds has the most stable enol tautomer?

Name: Which of the following compounds has the most stable enol tautomer?
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Question

Quizplus · Accepted Answer

Compound C (2,4-pentanedione) has the most stable enol tautomer because it has two electron-withdrawing carbonyl groups in a conjugated system, which stabilizes the enol form through resonance. The other compounds either have only one carbonyl group (A and D) or the carbonyl group is not in a conjugated system (B and E), making their enol tautomers less stable.

Which of the Following Compounds Has the Most Stable Enol