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IUPAC name of the following is CH2 = CH – CH2 – CH2 – C ≡ CH

1. 1, 5-hexenyne
2. 1-hexene-5-yne
3. 1-hexyne-5-ene
4. 1, 5-hexynene

Correct answer: 1-hexene-5-yne

Solution

The correct IUPAC name is 1-hexene-5-yne because the double bond (ene) is given priority over the triple bond (yne) in numbering, and the chain is numbered to give the lowest possible locants.

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