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Q.

Arrange the following in the increasing order of stability of their most stable enol.

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a

II < I < IV < III

b

IV < III < II < I

c

III < IV < II < I

d

I < II < III < IV

answer is B.

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Detailed Solution

Di keto (I) forms highest enol content due to stabilization of enol by intermolecular H-bonding' Electron donating resonance effect by ester group slightly decreases enol content.

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