Answer:
Tautomers are organic compound isomers that may rapidly interconvert via a chemical process known as tautomerization. They are structural isomers distinguished by the positioning of a proton and a double bond.
The relative stability of each form determines the equilibrium between keto and enol tautomers. Because of the increased electronegativity of the carbonyl oxygen, which stabilises the negative charge produced by the enolization process, the keto form is typically more stable than the enol form. As a result, the equilibrium is often on the keto side.