Question

Indicate the relationship of the following pairs of compounds.

Indicate the relationship of the following pairs of compounds.

Answer 1

Concepts and reason

The relationship between a pair of compounds can be explained by isomerism. The compounds that exhibit isomerism are called isomers. The isomers can be of two types, namely, constitutional isomers and stereoisomers.

Fundamentals

Isomers: The compounds of the same molecular formula but differ in the structural and spatial arrangement of atoms.

Constitutional Isomers: Two compounds with the same molecular formula but different connectivity of atoms. Example: methoxyethane and propan-1-ol have the same molecular formula (C₃H₈O) and the connectivity is different.

Stereoisomers: Two compounds with same molecular formula but the orientation of atoms are different in space. Stereoisomers are two types:

1.Enantiomers = The compounds with chiral (carbon bonded to 4 different groups) centers and non – superimposable mirror images. According to the priority, R and S configuration should be mentioned.

2.Diastereomers = The chiral centers of two compounds gives opposite configuration. These compounds do not have mirror images.

In the above compounds, A and B, C and D are mirror images of each other. Therefore, A and B, C and D are enantiomers. A and C, B and D are not mirrored images with each other. Therefore A and C, B and D are diastereomers.

The given compound is identical.

Both compounds have same molecular formula with same configuration. Therefore, it is identical compounds.

The given compounds are enantiomers.

Ans:

The given compounds are identical.

The given compounds are enantiomers.