The IUPAC name of the compound CH _3 CH = CHC CH is :

NEET 2010 Chemistry question

The IUPAC name of the compound is :

(1)Pent-4-yn-2-ene
(2)Pent-3-en-1-yneCorrect
(3)Pent-2-en-4-yne
(4)Pent-1-yn-3-ene

Answer: (2)

Solution

The longest chain has five carbons and contains both a double and a triple bond, so the name is of the "alkenyne" type (pentenyne), with the suffix "-yne" at the end. Number the chain so that the multiple bonds get the lowest locants as a set: from the alkyne end,

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Question ID VK-090387