Match List-I (Fuel Gases) with List-II (Major Constituents) and select the correct answer using the codes given below the Lists

(Fuel Gases) | (Major Constituents)
A. CNG | 1. Carbonmonoxide, Hydrogen
B. Coal gas | 2. Butane, Propane
C. LPG | 3. Methane, Ethane
D. Water gas | 4. Hydrogen, Methane, Carbonmonoxide

Correct matching is: A (CNG) → methane/ethane, B (Coal/town gas) → hydrogen and methane, C (LPG) → propane and butane, D (Water gas) → carbon monoxide and hydrogen. Natural gas (CNG) consists predominantly of methane (often 80–90%), making methane/ethane the principal constituents for A [1]. Water gas is a well‑known synthesis gas composed mainly of carbon monoxide and hydrogen, identifying D with CO + H2 [2]. Coal‑derived town/coal gas contains a large fraction of hydrogen together with methane (and some CO), supporting B → H2 + CH4 [3]. LPG is commercially a mixture of propane and butane (C3 and C4 hydrocarbons), giving C → propane/butane. Hence option 2 is correct.

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 9: Distribution of World Natural Resources > natural gas as a Resource > p. 15
2. [2] https://en.wikipedia.org/wiki/Water_gas
3. [3] https://home.agh.edu.pl/~jodlowsk/en/cc/lectures/CarbonChem9gasification.pdf