Question

Classify the following alkenes in terms of E/Z stereoisomer configurations.

Answer 1

Concepts and reason

The basic concept used in the problem is the representation of configuration of molecules as E-Z configuration.

Fundamentals

E and Z configurations are possible in the molecule if it consists a double bond around which groups of different priorities are present. If same priority groups are present on same sides of molecule, the configuration is Z and if same priority groups are present on different sides of molecule, the configuration is E.

Part A

Priority order of groups in A are shown

This double bond has Z configuration.

Part B

Priority order of groups in A are shown

This double bond has configuration.

Part C

Priority order of groups in A are shown

This double bond has configuration.

Part D

Neither E nor Z configuration is possible across D

Ans: Part A

The stereoisomer has Z configuration.

Part B

The stereoisomer has E configuration.

Part C

The stereoisomer has Z configuration.

Part D

The stereoisomer has neither configuration.