In my textbook, under the topic "Conditions for geometrical isomerism", the following has been given:
Groups responsible to show geometrical isomerism must be nearly in the same plane.
Is this statement really true? Because, we are well aware that disubstituted cycloalkanes which show geometrical isomerism are not planar. Eg: 1,2-Dimethylcyclopropane
Kindly explain with examples.