IUPAC name of the following is CH _2 = CH - CH _2 - CH _2 - C CH

NEET 2002 Chemistry question

IUPAC name of the following is

(1)1, 5-hexenyne
(2)1-hexene-5-yneCorrect
(3)1-hexyne-5-ene
(4)1, 5-hexynene

Answer: (2)

Solution

The longest chain containing both multiple bonds has 6 carbons (hex). Numbering from either end gives the same set of locants for the multiple bonds (from the left: ene at 1, yne at 5; from the right: yne at 1, ene at 5). When there is a choice, the double bond gets the lower locant, so numbering starts

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Question ID VK-089019