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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

How many of the following compounds show geometrical isomerism: pent-2-ene, 1-phenylprop-1-ene, 2-methylbut-2-ene, 3,4-dimethylhex-3-ene, pent-1-ene, 3-methylpent-2-ene?

Answer: 4

Solution

Geometrical isomerism requires each alkene carbon to bear two different substituents. Pent-2-ene (CH vs. H; CHCH vs. H — both differ): yes. 1-Phenylprop-1-ene (Ph vs. H; CH vs. H — both differ): yes. 2-Methylbut-2-ene (one carbon bears two identical

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Question ID VK-142886