Question

Which of the following represents tautomerism?

• A.
• B.
• C.
• D. None of the above.

Answer 1

Answer: (A), (B), (C)

The correct options are
A
B
C

Tautomers are isomers of a compound which differ only in the position of the protons and pi cloud. The carbon skeleton of the compound is unchanged. A reaction which involves simple proton transfer in an intramolecular fashion is called a tautomerism.
Tautomerisation can be catalysed by a base or an acid.