Chemistry - GOC Question with Solution | TestHub

Enol content depends on how much the enol form is stabilised.

(III) Pentane-2,4-dione is a 1,3-diketone: its enol is conjugated and strongly hydrogen bonded (about 80% enol).

(II) Ethyl acetoacetate is a β-ketoester: the same stabilisation, but the ester $\mathrm{C}=\mathrm{O}$ is a weaker acceptor because of its own resonance (about 8% enol).

(I) Propanone has no such stabilisation (about $10^{-4}$ % enol).

Order: III $>$ II $>$ I.

Answer: (C).