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Question
Which of the following compounds have stable enol form?
Which of the following compounds have stable enol form?
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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.
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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