Question

Match List - I with List II and select the correct answer using the code given below the lists.

List -I	List -II
A. Meso compounds	1. An equimolar mixture of enantiomer
B. Enantiomers	2. Stereoisomers that are not mirror images
C. Diastereoisomers	3. Non superimposable mirror images
D. Racemic mixture	4. An optically inactive compound whose molecules are achiral even though they contain chiral centre

• A. $$\begin{array}{cccc}A& B& C& D\\ 3& 4& 1& 2\end{array}$$
• B. $$\begin{array}{cccc}A& B& C& D\\ 4& 3& 2& 1\end{array}$$
• C. $$\begin{array}{cccc}A& B& C& D\\ 3& 4& 2& 1\end{array}$$
• D. $$\begin{array}{cccc}A& B& C& D\\ 4& 3& 1& 2\end{array}$$

Answer 1

The correct option is B $$\begin{array}{cccc}A& B& C& D\\ 4& 3& 2& 1\end{array}$$

Enantiomers are non-superimposable mirror images and they are optically active.

Diastereomers are stereoisomers whose molecules are not mirror images of each other.

Mesomers have chiral carbon but they lack optical activity due to the presence of element of symmetry except axis of symmetry.

Racemic mixture is the equimolar mixture of d- and l-isomer of an compound. They are optically inactive because both isomer nullify each other light rotation property.
Thus,
$$\begin{array}{cccc}A& B& C& D\\ 4& 3& 2& 1\end{array}$$