The IUPAC name of the compound having the formula CH≡C−CH=CH2 is
3-butene-1-yne
1-butyn-3-ene
but-1-yne-3-ene
1-butene-3-yne
In IUPAC nomenclature, double bond is given more preference than triple bond
4 3 2 1CH≡C−CH=CH21−butene−3−yne