Question

Determine if each compound is identical to or an enantiomer of A.

a.

b.

c.

Short answer

1. It is the S enantiomer of A.
2. It is identical to A.
3. It is the S enantiomer of A.

Step-by-step solution

Definition of an enantiomer

A stereoisomer has two enantiomers. The enantiomers of any compound are the non-superimposable mirror images of each other and are not identical to each other.

The two enantiomers of any compound cannot be identical even after the reorientation of the molecule.

Identification of an enantiomer

The enantiomers of a compound have the same kind of connectivity between the atoms. Two enantiomers of a compound have the opposite three-dimensional arrangement of their atoms in terms of their shapes.

Identification of the given compound as identical or isomer of A

The structure of compound A is shown below:

Representation of R isomer

After assigning the priority to the various groups it is identified as the R isomer.

a. It is an enantiomer of A. It is the S isomer of A.

Representation of S isomer

b. It is identical to A.

Representation of S isomer

c. It is the S enantiomer of A.

Representation of S isomer