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Arrange the following in the increasing ...

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

A

`I lt II lt III lt IV`

B

`IV lt III lt II lt I`

C

`II lt I lt IV lt III`

D

`III lt IV lt II lt I`

Text Solution

Verified by Experts

The correct Answer is:
B
Diketo `(I)` forms highest enol content due to stabilisation of enol by intermolecular `H`-bonding. Electron donating resonance effect by ester group slightely decreases enol content.
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