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B
Functional isomers
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C
Tautomers
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D
Metamers
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Solution
The correct option is C Tautomers (a) and (b) are both functional isomers and tautomers.
(a) has amide group and (b) has alcohol group. Hence they show a difference in the functional groups present in the carbon chain, thus acting as functional isomers.
They also act as tautomers.
Enol form i.e., (b) is more stable than keto form (a), because it is aromatic in nature.