JEE Main Chemistry question
How many of the following compounds do **not** exhibit geometrical isomerism: 1-phenylbut-2-ene, but-2-yne, 1,1-diphenylpropene, 3,4-dimethylhex-3-ene, 3-phenylbut-1-ene, 2,2-dimethylpropane, 1,2-dichloro-1,2-difluoroethene, pent-2-yne?
Answer: 5
Solution
1-Phenylbut-2-ene and 1,2-dichloro-1,2-difluoroethene and 3,4-dimethylhex-3-ene each have different substituents on both alkene carbons and so *do* show geometrical isomerism (excluded from the count). But-2-yne and pent-2-yne are triple bonds (no cis/trans
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