Question

Question: (a) Draw all possible stereoisomers of 4-methylnon-2-ene, and name each isomer, including its E, Z and R, S prefixes. (b) Label two pairs of enantiomers. (c) Label four pairs of diastereomers.

Short answer

Answer

(b) Enantiomers: A and B, C and D

(c) Diastereomers: A and C, B and C, A and D, B and D

Step-by-step solution

Stereoisomers

Stereoisomers differ in the orientation of the substituents such that one compound has R-configuration and the other compound has S-configuration.

Structures for a, b, and c

(a) The given compound is 4-methylnon-2-ene. Its stereoisomers are mentioned below:

Isomers

(b) Enantiomers are stereoisomers that are non-superimposable mirror images. Thus,the enantiomers are

• A and B
• C and D

(c) Diastereomers are stereoisomers that are neither mirror images, nor superimposable. Thus, the diastereomersare

• A and C
• B and C
• A and D
• B and D