The IUPAC name of the compond CH3CHCHCCH is

1) Pent-4-yn-2-ene

2) Pent-3-en--1-yne

3) Pent-2-en-4-yne

4) Pent-1-yn-3-ene

The answer is given option (2) but isnt priority of double bond greater than triple bond.

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