The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is
(1) Retention occurs in \(S_N1\) reaction and inversion occurs in \(S_N2\) reaction.
(2) Racemisation occurs in \(S_N1\) reaction and retention occurs in \(S_N2\) reaction.
(3) Racemisation occurs in both \(S_N1\) and \(S_N2\) reactions.
(4) Racemisation occurs in \(S_N1\) reaction and inversion occurs in \(S_N2\) reaction.
