Which of the following is a combustion reaction?

Question

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11ecba2d_11dc_a4fd_a3bf_abeab66ca315_MD0008_00 Chemical reactions can be categorized broadly (but not exclusively) into five main types: combination, decomposition, single replacement, double replacement, and combustion. Combustion reactions involve the burning of a fuel (often a hydrocarbon, an alcohol, or another flammable organic compound) in the presence of oxygen, often from the air. When the supply of oxygen is plentiful, complete combustion occurs to form carbon dioxide (CO₂) and water. The reaction of methane (CH₄), a hydrocarbon fuel, with oxygen to form CO₂ and water is an example of a complete combustion reaction. Variations of combustion reactions also exist. For example, if the supply of oxygen is limited, carbon monoxide (CO) may form. Additionally, if the fuel contains atoms of nitrogen, sulfur, or other elements, then oxides of these atoms can also be produced as products. (Choice A) Although CO₂ and H₂O are the typical products formed during combustion, H₂CO₃ → CO₂ + H₂O is a decomposition reaction, wherein one reactant species breaks down into two or more product species (the opposite pattern of combination reactions). No fuel is being burned in the presence of oxygen in this reaction. (Choice B) The reaction C + H₂O → CO + H₂ follows the pattern of a single replacement, wherein a compound reacts with a free element (a substance in its elemental form that is not bonded with other types of atoms) and forms a new compound and a new element as the products. (Choice D) The reaction C + CO₂ → 2 CO is a combination reaction, wherein two or more chemical species combine and form one product species. Educational objective: Chemical reactions can be categorized broadly into five main types: combination, decomposition, single replacement, double replacement, and combustion. Combustion reactions involve the burning of a fuel in the presence of oxygen to form carbon dioxide and water (and sometimes other oxides).

Which of the Following Is a Combustion Reaction