NEET 2009 Chemistry question

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

(1)Butanol
(2)2-Butyne
(3)2-Butenol
(4)2-ButeneCorrect

Answer: (4)

Solution

Geometrical (cis-trans) isomerism requires a C=C bond with two different groups on each doubly bonded carbon. 2-Butene, , satisfies this and exists as cis-2-butene and trans-2-butene. Hence option (4). Butanol has no double bond

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Question ID VK-090318