Question

Are keto-enol tautomers, constitutional isomers?

Answer 1

1. Constitutional isomers- Constitutional isomers is another name for structural isomers. Structural isomers are compounds which have the same molecular formula but have different structures.
2. Keto-enol tautomerism- Tautomerism is an equilibrium between two forms (having the same molecular formula) of a compound that are readily interconvertible into each other for example keto and enol forms of carbonyl. Reaction depicting keto-enol tautomerism is given below-

3. Keto form and enol form are termed as tautomers of each other.

4. Since the keto form and enol form have the same molecular formula only their arrangement of atoms is different, they are structural isomers of each other.

Yes, keto-enol tautomers are structural isomers/ constitutional isomers.