IUPAC name is the systematic name of organic compound. IUPAC name of Acetylene dichloride is

$$\begin{gathered} \mathrm{Acetylene} \mathrm{dichloride} \mathrm{is} \mathrm{Cl}-\mathrm{CH}=\mathrm{CH}-\mathrm{Cl} ; \\ 1 2 \\ \mathrm{Root} \mathrm{word}-\mathrm{Eth}; 1^0 \mathrm{suffix}-\mathrm{ene} ; \\ \mathrm{Prefix}-\mathrm{dichloro} \end{gathered}$$