Question

Question:Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers?

Short answer

a. The two structures in a are enantiomers.

b. The two structures in b are diastereomers.

Step-by-step solution

Definition of enantiomer, diastereomer, constitutional isomer

a. Identical: If a compound and its mirror image has exactly same structure,the compound is called identical.

b. Enantiomer: If a compound has a mirror image which is exactly opposite of the original compound, but don’t superimpose with each other is called enantiomers. Enantiomers also posses a plane of symmetry in a molecule.

c. Diastereomers: The compounds that has no mirror image, are non-identical and don’t superimpose with each other is known as diastereomers.

d. Constitutional isomer: The compounds that has same molecular formula but the connectivity through atoms in a bond are different and has no chiral centre are called constitutional isomers. They are also called structural isomers.

Explanation of the answers

Here A and B are not a mirror image, not superimposable and not same in structure.so they are diastereomers.