Question

Which one of the following can show cis-trans isomerism?

• A.
• B.
• C.
• D. All of the above.

Answer 1

The correct option is D All of the above.

Conditions for geometrical isomers:
1) Free rotation must be restricted.
2) Both the terminals must be attached with different groups.
3) Terminals must not be in perpendicular planes.

a has two different groups attached to the terminal carbon of the both double bond so it can show cis-trans isomerism

b has two different groups attached to the terminal carbon of the both double bond so it can show cis-trans isomerism

c has two different groups attached to the terminal carbon of the both double bond so it can show cis-trans isomerism


Since all compounds have the different groups attached to double bonded carbon atom thus all exhibit cis-trans isomerism.