Which of the following compounds can have a triple bond?

C₂H₄, C₃H₄, C₃H₆,

The hydrocarbons which having triple bond are called alkyne. The general formula of alkyne is C_nH_2n-2. Here, n is number of carbon atoms.

In alkyne, the number of hydrogen atom is 2 less than double the number of carbon atoms.

Thus, the compound C₃H₄ (Propyne) have a triple bond.