What is Tautomerism? - QS Study
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Tautomerism: A reaction which involves simple proton transfer in an intramolecular fashion is called a tautomerism. It is one type of kinetic functional isomerism. It is a phenomenon by which two constitutional isomers become mutually inter-convertible & exist in dynamic equilibrium. The two different structures are called tautomers.

Examples: Propanone and propene-2-ol are tautomers of each other.

keto-enol_tautomerism