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Explain why exists in keto form but ex...

Explain why exists in keto form but exists in the enol form?

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Enol form (II) is not stabilized and hence it exists in the keto form (I)
Enol form (IV) is stabilized by resonance energy `(151 kJ mol^(-1))` of the benzene ring and hence (III) exists in the enol form (IV).
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