Ncert Exercises & Solutions

A primary alkyl halide would prefer to undergo ..........

$1 . S_{N} 1 reaction$
$2 . S_{N} 2 reaction$
$3 . α ‐ elimination$
$4 . racemisation$

(b) A primary alkyl halide would prefer to undergo

S_{N} 2

reaction.

(a) $S_{N} 1$ reactions occur only if the intermediate carbocation is stable i.e., 3 $°$

carbocation.

(b) $S_{N} 2$ reactions occur if there is less steric hindrance on to the a-carbon of alkyl

halide. in case of primary alky\ halides, carbocation is highly unstable and steric

hinderance is very less. So, primary alkyl halide would prefer to undergo $S_{N} 2$

reaction.

(d) Racemisation is the process of conversion of enantiomer into a racemic mixture.