Question

Pls explain the tautomerism.

Answer 1

Tautomers (/ˈtɔːtəmə/)[1] are constitutional isomers of chemical compounds that readily interconvert.[2][3][4] This reaction commonly results in the relocation of a proton. Tautomerism is for example relevant to the behavior of amino acids and nucleic acids, two of the fundamental building blocks of life.

The concept of tautomerizations is called tautomerism. The chemical reaction interconverting the two is called tautomerization.

Care should be taken not to confuse tautomers with depictions of 'contributing structures' in chemical resonance. Tautomers are distinct chemical species and can be identified as such by their differing spectroscopic data,[5] whereas resonance structures are merely convenient depictions and do not physically exist.