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Which of the following compounds shows geometrical isomerism?

1. Benzene
2. Decalin
3. O-Xylene
4. None of these

Correct answer: Decalin

Solution

Benzene and o-xylene are planar aromatic compounds with no restricted rotation giving rise to geometric isomers. Decalin has two fused six-membered rings sharing a C-C bond (the ring junction), and the two hydrogen atoms at the junction can be cis or trans, giving cis-decalin and trans-decalin — classic geometric (cis-trans) isomerism.

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