Q37 / 150 · MHT CET 2026 (13 April Shift 1) · Chemistry
Identify the false statement regarding chirality from the following.
- A$SN^1$ reaction yields 1:1 mixture of both enantiomers
- BA recemic mixture shows zero dipole rotation
- Correct answerCEnantiomers are superimposable mirror images of each other
- DThe product obtained by $SN^2$ reaction of haloalkane having chirality at the reactive site shows inversion of configuration
Solution
Enantiomers are defined as stereoisomers that are non-superimposable mirror images of each other. Therefore, the statement that enantiomers are superimposable mirror images is false.
In an $S_N1$ reaction, the formation of a planar carbocation intermediate allows the nucleophile to attack from either face with equal probability, generally yielding a 1:1 mixture of enantiomers (a racemic mixture).
A racemic mixture contains equal amounts of dextrorotatory and levorotatory enantiomers, resulting in zero net optical rotation.
In an $S_N2$ reaction at a chiral center, the nucleophile attacks from the side opposite to the leaving group, leading to a complete inversion of configuration.
Answer: Enantiomers are superimposable mirror images of each other
In an $S_N1$ reaction, the formation of a planar carbocation intermediate allows the nucleophile to attack from either face with equal probability, generally yielding a 1:1 mixture of enantiomers (a racemic mixture).
A racemic mixture contains equal amounts of dextrorotatory and levorotatory enantiomers, resulting in zero net optical rotation.
In an $S_N2$ reaction at a chiral center, the nucleophile attacks from the side opposite to the leaving group, leading to a complete inversion of configuration.
Answer: Enantiomers are superimposable mirror images of each other
Hence, the correct answer is option: 'C'.