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The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is :

1. Retention occurs in S N 1 reaction and inversion occurs in S N 2 reaction
2. Racemisation occurs in both S N 1 and S N 2 reactions
3. Racemisation occurs in S N 1 reaction and inversion occurs in S N 2 reaction
4. Racemisation occurs in S N 1 reaction and retention occurs in S N 2 reaction.

Correct answer: Racemisation occurs in S N 1 reaction and inversion occurs in S N 2 reaction

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