Question

Geometrical isomerism $\left(GI\right)$ may not be exhibited by:

• A. $1,2$ -Dichloro- $1$ -pentene
• B. $1,3$ -Dichloro- $1$ -pentene
• C. $1,1$ -Dichloro- $1$ -pentene
• D. $1,4$ -Dichloro- $2$ -pentene

Answer 1

Answer: (C)

Geometrical isomerism: It arises due to restricted rotation of atoms or groups around the double bond. Restricted rotations are observed in unsaturated compounds and cycloalkanes.
Cis, trans isomerism type of geometrical isomerism are described below:


It has two similar chlorine atoms on the same carbon.