Among the following statements, choose the correct statements.
A. SN2 reaction proceeds with stereochemical inversion.
B. The process of conversion of Racemic mixture into two enantiomers is known as Racemization.
C. A mixture containing 2 enantiomers in equal proportions is known as Racemic mixture.
D. The stereoisomers related to each other as superimposable on their mirror image are called enantiomers.
E. The objects which are non-superimposable on their mirror image are said to be chiral and this property is known as chirality.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A, C, and E only
(A) SN2 reaction proceeds with stereochemical inversion — True. The nucleophile attacks from the side opposite to the leaving group, so the configuration is inverted (like an umbrella turned inside out in the wind).
(B) The process of conversion of Racemic mixture into two enantiomers is known as Racemization. — False. Racemisation is the reverse: the conversion of an enantiomer into a racemic mixture. Separating a racemic mixture into its two enantiomers is called resolution.
(C) A mixture containing 2 enantiomers in equal proportions is known as racemic mixture — True. It has zero optical rotation, because the rotation due to one isomer is cancelled by that due to the other.
(D) The stereoisomers related to each other as superimposable on their mirror image are called enantiomers. — False. Enantiomers are non-superimposable mirror images of each other.
(E) The objects which are non-superimposable on their mirror image are said to be chiral and this property is known as chirality — True. Example: butan-2-ol, whose C-2 carries four different groups.
NCERT (2026-27 edition):
Reactions of Haloalkanes – “… A mixture containing two enantiomers in equal proportions will have zero optical rotation, as the rotation due to one isomer will be cancelled by the rotation due to the other isomer. Such a mixture is known as racemic mixture or racemic modification. A racemic mixture is represented by prefixing dl or (±) before the name, for example (±) butan-2-ol. The process of conversion of enantiomer into a racemic mixture is known as racemisation.”