Question
The IUPAC name of the compound having the formula $$CH \equiv C - CH = C{H_2}$$ is
A.
$$3 - butene - 1 - yne$$
B.
$$1 - butyn - 3 - ene$$
C.
$$but - 1 - yne - 3 - ene$$
D.
$$1 - butene - 3 - yne$$
Answer :
$$1 - butene - 3 - yne$$
Solution :
In IUPAC nomenclature, double bond is given more preference than triple bond.
$$\mathop {CH}\limits^4 \mathop { \equiv \mathop C\limits^3 - \mathop {CH}\limits^2 = \mathop {C{H_2}}\limits^1 }\limits_{1 - butene\,\, - 3\,\, - yne} $$