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2C2H6 + 7O2 -> 4CO2 + 6H2O C2H4 +3 O2 -> 2CO2 + 2H2O 2C2H2 + 5O2 -> 4CO2 + 2H2O CH3-CH3 + Br2 -> CH3-CH2-Br + HBr CH2=CH2 + Br2 -> CH2(Br)-CH2(Br) CH=-CH + 2Br2 -> CH(Br)2-CH(Br)2 CH2=CH2 + HBr -> CH3-CH2-Br CH=-CH +2 HBr -> CH3-CH(Br)2