MHTCET 13 Apr 2026 Shift 1 Paper

Concept:Chirality involves non-superimposable mirror images, while reactions at chiral centres may change or retain configuration.Explanation:Enantiomers are pairs of molecules that are mirror images of each other but are not superimposable.Therefore, statement C, which says enantiomers are superimposable, is false.Option A is true because $S_{N}1$ proceeds through a planar carbocation intermediate.The nucleophile can attack from either face, producing equal amounts of both enantiomers.Thus, an $S_{N}1$ reaction generally gives a 1:1 racemic mixture.Option B is also true in its intended meaning: a racemic mixture has equal concentrations of both enantiomers.Their rotations cancel, so the observed optical rotation is zero.Strictly speaking, the correct term is optical rotation, not dipole rotation.Option D is true because $S_{N}2$ involves backside attack by the nucleophile.If the carbon atom is chiral, the product shows inversion of configuration.Answer:The false statement is Option C.Enantiomers are non-superimposable mirror images of each other.