The incorrect statement regarding chirality is :
(1) A racemic mixture shows zero optical rotation.
(2) SN1 reaction yields 1 : 1 mixture of both enantiomers.
(3) The product obtained by SN2 reaction of haloalkane having chirality at the reactive site shows inversion of configuration.
(4) Enantiomers are superimposable mirror image on each other.