Question

Identify the pairs of diastereomers from the following.

• A. I and II, II and III
• B. II and III only
• C. I and III only
• D. None of these

Answer 1

The correct option is A I and II, II and III

Compound (II) is a mesomer because it posses a plane of symmetry. Hence it related to others stereoisomers of compound by diastereomeric reationship. It can also be explained by absolute configuration.


All the given compound has two chiral centre.
If two compound have different absolute configuration in both chiral centre then they are related by enantiomerism.
If two compound have same absolute configuration at one chiral centre and different absolute configuration at another chiral centre, then, they are related by diastereomerism.



I and II, II and III are pair of diastereomers.