Match List-I (Fuel Gases) with List-II (Major Constituents) and select the correct answer using the codes given below the Lists: List-I (Fuel Gases) - List-II (Major Constituents) 1. A. CNG - 1. Carbon monoxide, Hydrogen 2. B. Coal gas - 2. Butane, Propane 3. C. LPG - 3. Methane, Ethane 4. D. Water gas - 4. Hydrogen, Methane, Carbon monoxide

Matching the Fuel Gases with their Major Constituents: 1. A. CNG (Compressed Natural Gas) - Primarily composed of Methane (CH4), often with smaller amounts of Ethane and other hydrocarbons. So, A matches with 3. 2. B. Coal gas - Produced by heating coal in the absence of air. Its composition varies but typically includes Hydrogen (H2), Methane (CH4), and Carbon monoxide (CO). So, B matches with 4. 3. C. LPG (Liquefied Petroleum Gas) - Primarily composed of Butane and Propane. So, C matches with 2. 4. D. Water gas - Produced by passing steam over red-hot coke (carbon). It is mainly a mixture of Carbon monoxide (CO) and Hydrogen (H2). So, D matches with 1. Therefore, the correct matching sequence is A-3, B-4, C-2, D-1.