Among the following distinct organic structures, which strictly exhibit Geometrical Isomerism? — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

To show GI, each carbon of the double bond must have two *different* attached groups. In 1-Phenyl-2-butene ($Ph-CH_2-CH=CH-CH_3$), C2 has H and $CH_2Ph$, while C3 has H and $CH_3$. In 1-Chloro-1-propene ($Cl-CH=CH-CH_3$), C1 has H and Cl, while C2 has H and $CH_3$. 2-Phenyl-1-butene and 1,1-Diphenyl-1-propene both have two identical groups on one of the $sp^2$ carbons.