JEE Main 2002 Chemistry question

Which of the following does not show geometrical isomerism?

(1)1, 2-dichloro - 1- pentene
(2)1, 3 - dichloro - 2- pentene
(3)1, 1- dichloro - 1- penteneCorrect
(4)1, 4 - dichloro - 2- pentene

Answer: (3)

Solution

Geometrical (cis–trans) isomerism needs each doubly bonded carbon to carry two different groups. In 1,1-dichloro-1-pentene, Cl_2C=CH-CH_2CH_2CH_3, C-1 carries two identical Cl atoms, so no geometrical

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Question ID VK-037941