The IUPAC name of the compound having the formula CH C - CH = CH _2 is:

NEET 2009 Chemistry question

The IUPAC name of the compound having the formula is:

(1)1-butyn-3-ene
(2)but-1-yne-3-ene
(3)1-butene-3-yneCorrect
(4)3-butene-1-yne

Answer: (3)

Solution

The compound has four carbons with a double bond and a triple bond (an enyne). In IUPAC nomenclature of enynes the chain is numbered to give the lowest locants to the multiple bonds taken together; when there is a choice, the double bond gets the lower number. Numbering from either end gives the locant set {1,3}, so

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Question ID VK-090317