UPTET Paper 2 Math and Science Model Test 4

Concept:Butane is a saturated hydrocarbon (alkane) with four carbon atoms. Its formula follows the general alkane formula $C_nH_{2n+2}$.Explanation:For $n=4$, the formula becomes $C_4H_{10}$.Butane is a colourless, highly flammable gas that liquefies easily.In excess oxygen, it burns to give carbon dioxide and water: $$2C_4H_{10} + 13O_2 \rightarrow 8CO_2 + 10H_2O$$In limited oxygen, it produces carbon monoxide: $$2C_4H_{10} + 9O_2 \rightarrow 8CO + 10H_2O$$Common uses include fuel gas, gasoline blending, and as a feedstock for making ethylene and butadiene.Answer:Option A: $C_{4}H_{10}$