Which of the following is the example of `SN^(2)` reaction

Options

A. `CH_(3)Br+OH^(-)-CH_(3)OH+Br bar`
B. `CH_(3)underset(Br)underset(|)CHCH_(3)+OH^(-)rarrCH_(3)underset(Br)underset(|)(C)CH_(3)+Br^(-)`
C. `CH_(3)CH_(2)OH overset(-H_(2)O)rarrCH_(2)=CH_(2)`
D. `CH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)C-CH_(3)+OHbatrarrCH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)C-O -CH_(3)+Brbar`

Answer

A

Explanation

Only `1^(@)` alkyl halides `CH_(3)` Br undergoes `S_(N)2` reaction .