Question

Label the two stereogenic centers in each compound and draw all possible stereoisomers.

a.

b.

Short answer

a.

stereogenic centers

b.

Step-by-step solution

Stereogenic center

The four different groups are bonded with a common carbon. The carbon point is known as stereogenic center.

Stereoisomers

The stereoisomers are the enantiomers or diastereomers. The enantiomers are non-superimposable mirror images, and the diastereomers are not part of mirror images.

The formula to calculate stereoisomers from stereogenic centers is:${\text{2}}^n$.

Where n is the stereogenic center number.

Explanation

a. The stereogenic centers in the given compound are 2 as shown below:

stereogenic centers

Therefore, the possible stereoisomers are 4, which are the non-superimposable mirror images as shown:

Stereoisomers

Stereoisomers

b. The stereogenic centers in the given compound are shown as:

Stereogenic centers

The possible stereoisomers are the non-superimposable mirror images as shown:

Stereoisomers

Stereoisomers