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

Explanation

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