NEET 2022 Chemistry question on Basic Principles of Organic Chemistry

1. A.
   $S_N1$ reaction yields 1 : 1 mixture of both enantiomers
2. B.
   The product obtained by $S_N2$ reaction of haloalkane having chirality at the reactive site shows inversion of configuration
3. C.
   Enantiomers are superimposable mirror images on each other
4. D.
   A racemic mixture shows zero optical rotation

[NEET 2022]