Which of the following has the least stable enol form?
A
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B
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C
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D
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Solution
The correct option is C (a) The enol form becomes aromatic in nature and thus stable.
(b) Keto form has dipolar repulsion which get diminished in enol form. Moreover, there is hydrogen bonding in enol form which makes enol form more stable
(c) In this case, enol form is destabilised by the formation of anti aromatic compound.
(d) The molecules becomes aromatic in the enol form therefore, highly stable.