Identify the product in the reaction `PhC-=CMe overset(H_3O^(+),Hg^(2+)?)rarr`

Explanation

First of all `Hg^(2+)` ions form a complex (I) with the alkyne. The complex formed here is , however unsymmetrical in which the +ve charge lies on the carbon attached to the Ph ring since it is stabilized by resonance with the double bonds of the Ph ring. Later on nucleophilic attack of `H_2O` on this carbon ultimately leads to enol (II) which tautomerises to give ketone (III) .