Answer:
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.
Explanation:
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