Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Correct Option: (C)

Hexa-1,3,5-triene (C) shows geometrical isomerism because its central double bond ($-CH=CH-$) has two different groups ($-H$ and $-CH=C{H}_2$) attached to each carbon atom.

This restricted rotation allows the molecule to exist in distinct cis and trans (or E/Z) spatial arrangements.

Allenes (A) and spiro compounds (D) with an even number of cumulative bonds or rings have terminal groups in mutually perpendicular planes, exhibiting optical isomerism instead.

1,3-dichlorobenzene (B) is a flat, rigid aromatic ring system that cannot form geometrical configuration isomers.