Explain the mechanism of acid catalysed of an alkene to form corresponding alcohol.

Explanation

Alkenes engage in an acid catalysed hydration reaction using concentrated sulphuric acid as a catalyst that gives usually secondary or tertiary alcohols . Alkenes reacts with NBS and water in halohydrin formation reaction . The formation of secondary alcohol via reduction and hydration is shwon :
(i) `H_(2)SO_(4) to 2 H^(+) + S O_(4)^(2-)`
(ii) `H-underset(* *)underset(*)(O)-H + H^(+) to H_(3)O^(+)`

Alkene reacts with `H_(3)O^(+)` to form a carbocation which reacts with `H_(2)O` to form alcohol.