Question

Total number of enolisable hydrogen present in the following given compound is

Answer 1

1

Answer 2

Enolisable hydrogens are those attached to the α‑carbon (adjacent to the carbonyl). In the given chalcone derivative

only the α‑carbon (the CH between the C=O and the C=C) has a hydrogen that can be deprotonated to form the enolate. The vinylic H on the C=C is not enolisable. Hence, there is 1 enolisable hydrogen.