Which among the following compound will show tautomerism?
The correct option is
B & C
2,2-dimethyl - 1 nitropropane
For aldehydes and ketone to exhibit ketol-enol tautomerism, it is essential that it must have at least one alpha hydrogen. For example, acetophenone and butan-2-one show keto-enol tautomerism, but benzaldehyde and benzophenone don't show keto-enol tautomerism, since they don't have any alpha hydrogens.
(A)
In the above structure, there is no alpha hydrogen, hence it will not undergo tautomerism.
In the above B and C structures due to alpha hydrogen do undergo tautomerism.