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Question

The compound(s) which show tautomerism is/are :

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 D
For (a) Nitroso-oxime tautomerism is shown as follows :

Here Nitroso form is more stable due to aromaticity.
For (b) and (d) :


In (b) keto form is more stable because there is no stabilizing factor in enol form .
In (d) the enol form is highly stable because it is aromatic in nature
In compound (c) there are no sp3 hybridised carbon having α-hydrogens, so no tautomerism is observed in this case


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