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

Options

A. `CH_3Br+OH^(-) rarr CH_3OH + Br^(-)`
B. `CH_3underset(Br)underset(|)CHCH_3+OH^(-) rarr CH_3underset(OH)underset(|)CHCH_3+Br^(-)`
C. `CH_3CH_2OH overset(-H_2O)(rarr)CH_2=CH_2`
D. `CH_3-overset(CH_3)overset(|)underset(Br)underset(|)(C)-CH_3+OH^(-) rarr CH_3 -overset(CH_3)overset(|)underset(H)underset(|)(C)-O-CH_3+Br^(-)`

Answer

A

Explanation

Only `1^@` alkyl halides, i.e. `CHBr_3` undergoes `S_N^2` reaction.