NEET 2022 · ChemistryPrevious Year Question

The incorrect statement regarding chirality is:

Answer: (C) Enantiomers are superimposable mirror images of each other. \textbf{Answer:} (c) Enantiomers are superimposable mirror images of each other \textbf{Solution:} Enantiomers are non-superimposable mirror images of each other, so statement (c) is the incorrect one.

A. $S X_{N} 1$ reaction yields a 1 : 1 mixture of both enantiomers
B.The product obtained by $S X_{N} 2$ reaction of a haloalkane having chirality at the reactive site shows inversion of configuration
C.Enantiomers are superimposable mirror images of each other✓
D.A racemic mixture shows zero optical rotation

Correct Answer

Solution & Explanation

\textbf{Answer:} (c) Enantiomers are superimposable mirror images of each other \textbf{Solution:} Enantiomers are non-superimposable mirror images of each other, so statement (c) is the incorrect one. The other statements are correct: $S X_{N} 1$ proceeds via a planar carbocation attacked from both faces, giving a racemic (1:1) mixture; $S X_{N} 2$ proceeds with backside attack giving inversion of configuration; a racemic mixture is optically inactive (zero rotation) because the equal amounts of enantiomers cancel.

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