Write the structures of the isomers of alcohols with molecular formula `C_(4)H_(10)O` Which of these exhibits optical acitvity ?

Explanation

`CH_(3)CH_(2) underset((i)) (CH_(2))CH_(2)OH, " " CH_(3)CH_(2) underset(OH) underset(|)(CH)CH_(3)`,
`CH_(3)-underset((iii)) underset(CH_(3)) underset(|)(CH)CH_(2)OH, " " CH_(3)- underset((iv) underset(CH_(3)) underset(|) overset(CH_(3)) overset(|)(C)-OH`
(ii) is optically acitve.