The incorrect statement regarding chirality is :
1. A racemic mixture shows zero optical rotation.
2. \(S_N1\) reaction yields 1 : 1 mixture of both enantiomers.
3. The product obtained by \(S_N2\) reaction of haloalkane having chirality at the reactive site shows inversion of configuration.
4. Enantiomers are superimposable mirror images on each other.