Which of the following alkenes will give optically active alcohol when treated with `H_(2)O //H_(2)SO_(4)`

Options

A. But`-1-`ene
B. Ethnene
C. propene
D. `2-`Methylpropene

Answer

A

Explanation

The reaction involves additions of water according to Markovnikov's orientation: ltbRgt `underset("Bure-1-ene")(CH_(3)CH_(2)CH=CH_(2))overset(H_(2)O ///H_(2)SO_(4))(rarr)CH_(3)CH_(2)underset("Butan-2-ol")underset(OH)underset(|)(overset(**)(C )HCH_(3))`
The resulting alcohol is optically acitve on account of the presence of a chiral carbon atom, `(C**)`
`CH_(2)=CH_(2)rarrCH_(3)CH_(2)OH`
`CH_(3)CH=CH_(2)rarr overset(OH)overset(|)(CH_(3)CHCH_(3))`
`CH_(3)underset(CH_(3))underset(|)(C)=CH_(2) rarr overset(OH)overset(|)underset(CH_(3))underset(|)(CH_(3)C CH_(3))`
Other alcohols are optically inactive.