Arrange the following in the increasing order of stability of their most stable enol.
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a
I < II < III < IV
b
IV < III < II < I
c
II < I < IV < III
d
III < IV < II < I
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.