Question

Highest enol content will be shown by

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

2

Answer 2

The highest enol content is observed in compounds where the enol form is significantly stabilized. β-Diketones, like cyclohexane-1,3-dione, form highly stable enols due to two primary factors: extended conjugation between the carbonyl and the newly formed double bond, and strong intramolecular hydrogen bonding between the enolic hydroxyl group and the oxygen of the other carbonyl group. This hydrogen bonding forms a stable six-membered ring, which greatly favors the enol tautomer. Other given compounds either lack these specific stabilizing features (simple ketone, 1,4-diketone) or form less stable intramolecular hydrogen bonds (1,2-diketone).