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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g2203

Which of the following factors increase the enol content of a carbonyl compound?

AConjugation of the enolic $C = C$ with another $C = O$ group
BIntramolecular hydrogen bonding in the enol
CA non-polar solvent for an enol that is chelated by an intramolecular hydrogen bond
DRemoval of all alpha hydrogens by substitution with alkyl groups

Answer: A, B, C

Conjugation (A) and chelation (B) stabilise the enol. A chelated enol is less polar than the keto form, so non-polar solvents increase its share (C). Removing all alpha hydrogens makes enolisation impossible, so (D) is wrong.

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