How does water add on to propyne? Give the equations and explain.

Explanation

`CH_(3)-C-=CH+HOHunderset(Hg^(2+))overset(H_(2)SO_(4))rarr[CH_(3)-underset(O)underset(||)underset(CH_(3)-C-CH_(3))underset(darr)underset(OH)underset(|)(C)=CH_(2)]`
In the first step, water adds on to propyne following Markovnikov rule. Being an enol, it is unstable and undergoes tautomerisation to form stable propanone.