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Question

Which of the following compounds have stable enol form?

A
(a) only
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B
(b) only
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C
(a) and (d) only
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D
(d) only
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Solution

The correct option is D (d) only

Tautomerism is a phenomenon where a single compound tends to exist in two or more structures which are interconvertible and differ in the relative position of one atomic nucleus.

In Keto-enol tautomerism, delocalisation takes place between a >C=O group and an alpha H where the equilibrium lies between a keto form and an enol form.

Here, compounds (a) , (b) and (c) do not have a enol form due to absence of H-atom on the carbon adjacent to carbonyl group.
For (d) , enol form :


This is highly stabile due to aromaticity.


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