From the given equations, the combustion reaction is; C₄H₁₂ + 7O₂ --> 4CO₂ + 6H₂O Combustion reactions are when organic compounds react with O₂ to produce water and CO₂. From the given reactions, C₄H₁₂ is an organic compound that reacts with O₂ to produce water and CO₂. Therefore this is the only reaction that follows the general equation for combustion.
