Answer:
The last option is correct.
Explanation:
Tautomerism varies in the role of double connection as well as atomic hydrogen as tautomerism is established. It provides a dynamical balance between organic compounds with the identical molecular structure with various functional groups. Tautomerism is called this phénomene.
For example, in ketone double bond keto-enol tautomerism is transformed among carbon and oxygen into enol bonding changes from CO through C & hydrogen from carbon to oxygen.
So, according to the following reason that describes the other options are not appropriate to the given scenario.