Question

Geometrical isomerism is caused:

• A. by restricted rotation around C = C bond
• B. by the presence of one asymmetric carbon atom
• C. due to the different groups attached to the same functional group
• D. by swing of hydrogen atom between two divalent atoms

Answer 1

The correct option is A by restricted rotation around C = C bond

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.
Hence the correct answer is option (a).