The strength of a carbon-carbon bond is determined by the bond order, which refers to the number of electron pairs shared between the atoms. The higher the bond order, the stronger the bond.

Among carbon-carbon single, double, and triple bonds, the triple bond is the strongest. This is because a triple bond consists of three electron pairs shared between the carbon atoms, while a double bond consists of two electron pairs and a single bond consists of only one electron pair. The greater number of electron pairs in a triple bond results in a stronger bond.

The bond strengths of carbon-carbon single, double, and triple bonds are approximately 348 kJ/mol, 611 kJ/mol, and 839 kJ/mol, respectively.