Conversion of methane and monochtoromethane to acetylene, ethane, and ethylene via homogeneous oxidative pyrolysis is investigated in an isothermal continuous flow reactor employing steam and/or oxygen as oxidizing agents. The effects of monochloromethane to methane ratio in the feed (0.304−9.981), reactor temperature (973−1423 K), and reactor space time (0.0−3.76 s) on product distribution in the reactor effluent are studied. Steam is shown to be a more effective oxidizing agent than oxygen as far as production of C2species is concerned. Addition of steam in the feed suppresses formation of coke, carbon monoxide, and carbon dioxide. The efficacy of oxidative pyrolysis with steam is demonstrated by the substantially high selectivity of C2species (up to 74%).