Tautomers are ___________.

Coenzyme

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Structural isomers

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Isoenzyme

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Both A and B

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Solution

The correct option is D Structural isomers
Tautomers are the isomers that can be frequently interconverted. They are the two molecules with the same molecular formula which can interconvert in a rapid equilibrium. The most common tautomeric relationship in organic chemistry is the keto-enol pair. So the correct option is B.

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