A primary alkyl halide would prefer to undergo :-

Options

A. `S_(N)1` reaction
B. `S_(N)2` reaction
C. `alpha`-elimination
D. racemisation

Answer

B

Explanation

A primary alkyl halide would prefer to undergo `S_(N)2` reaction.
(a) `S_(N)2` reactions occur only if the intermediate carbocation is stable i.e., `3^(@)` carbocation.
(b) `S_(N)2` reactions occur if there is less steric hinderance on to the `alpha`-carbon of alkyl halide. In case of primary alkyl halides, carbocation is highly unstable and steric hinderance is very less, Sa, primary alkyl halide would prefer to undergo `S_(N)2` reaction.
(c) In `alpha`-elimination, proton and the leaving group are present on same atom.
(d) Racemisation is the process of conversion of enantiomer into a racemic mixture.