Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

Enol content tracks the stability of the enol. (B), cyclohexa-2,5-dien-1-one, enolises to phenol - aromatic, so its enol content is enormous. (D), cyclohexane-1,3-dione, gives a conjugated, intramolecularly H-bonded enol - high content. (C), cyclohex-2-en-1,4-dione, also gives a conjugated dienol. (A), cyclohex-2-en-1-one, can give only an ordinary dienol with no aromatic or H-bond stabilisation, so its enol content is the minimum.