Benzene has sp2-hybridized carbon atoms and multiple bonds. However, unlike
ethylene, geometric isomerism is not possible in benzene. Explain.
Aromatic hydrocarbons are "conjugated" systems composed of planar sp2 hybridized carbon atoms linked in cyclic structures.
As a result conformational (rotational) and optical isomerism is not possible in these structures.
Also, since aromatic hydrocarbons are linked in cycles, geometric ("cis/trans") isomerism also is not possible
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