Question

What is the relation between the given compounds?

• A. Constitutional isomers
• B. Enantiomers
• C. Diastereomers
• D. Identical

Answer 1

The correct option is C Diastereomers

The relation between the given structures can be determined with their absolute configuration.
The given structures are drawn in fischer projection and their absolute configuration is given,

If any one of the configuration of chiral centre is retained and others are changed, then it denotes the diastereomeric relation between them.
If all the chiral centre configuration are inversed, then they are enantiomers.
For the given molecules, the centre with $N{H}_2$ group have same configuration but another centre has inverse configuration.
So, they are diastereomers.
Hence, (c) is correct.