What are the product of completely combustion of alkene?

Complete oxidation of alkanes by oxygen yeilds carbon dioxide and water. Alkanes oxidation by O2, (CxH2x+2) + O2 = x CO2 + x+1 H2O. With Halogens it would be CyH2y+2 + X2 = CyX2y+2 + (y+2) HX. Carbon Carbon bonds often do not break in halogen oxidation. "often"