Question

what is meant by tartomerism ?

Answer 1

It is Tautomerism and it is a kind of functional Isomerism , where Keto and enol form of a compound exist and both are interconvertible due to resonance.

Also one condition for tautomerism is presence of alpha Hydrogen

Answer 2

the ability of certain organic compounds toreact in isomeric structures that differ from eachother in the position of a hydrogen atom and adouble bond