There is a triple covalent bond between the two carbon atoms in acetylene (C₂H₂).

Here's why:

* Acetylene's Structure: Acetylene has a linear structure with the two carbon atoms at the center and a hydrogen atom attached to each carbon.

* Carbon's Bonding: Carbon has 4 valence electrons and wants to form 4 bonds to achieve a stable octet configuration.

* Triple Bond Formation: In acetylene, each carbon atom forms one single bond with a hydrogen atom and shares three electrons with the other carbon atom, resulting in a triple bond.