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Stability order of the followings in the aqueous solution?



A.

i> ii> iii

B.

iii> ii> i

C.

iii> i> ii

D.

ii > iii > ii

Solution

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Enot form (iii) is stabilized hy H-bond and resonance, so more stable. Resonance is not possible in the enol form (ii) so it is less stable.