Question

Which of the following can show geometrical isomerism?

• A.
• B.
• C.
• D. All of the above.

Answer 1

The correct option is C

Biphenyl system: In both structure (a) and (b), phenyl rings are perpendicular to each other, thus, the ortho substituents of the two phenyl rings are not in the same plane. Hence, they don't show geometrical isomerism.
Triphenyl system: First and third rings are in the same plane and the ortho substitutents on each phenyl ring is different, thus, it will show geometrical isomerism.