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Question

Among the given compounds, which can exhibit tautomerism ?

A
I only
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B
II only
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C
III only
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D
All of the above
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Solution

The correct option is B II only
Conditions for tautomerism :
1. If a carbonyl compound having an H atom at its sp3 hybridised α-C atom
2. If an α,β unsaturated carbonyl
compound contains a γ-H at its sp3
hybridized γ-C atom.
Only in structure II, α-Hydrogens attached to sp3 hybridised carbons are present.
This is not the case in structure I and III
Enol form of structure II (as given below), is aromatic and thus stable.





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