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

The correct answer is B because of the specific chemical compositions of the four fuel gases listed.

1. CNG Compressed Natural Gas consists primarily of Methane and Ethane. Methane is the dominant component, usually making up over 80 to 90 percent of the mixture.

2. Coal Gas is a mixture of Hydrogen, Methane, and Carbon Monoxide. It is produced by the destructive distillation of coal.

3. LPG Liquefied Petroleum Gas is a mixture of Butane and Propane. These are hydrocarbons that are easily liquefied under pressure for domestic and industrial use.

4. Water Gas is a synthesis gas containing a mixture of Carbon Monoxide and Hydrogen. It is produced by passing steam over red hot coke.

Matching these based on the standard list: A. CNG matches with 3 Methane, Ethane. B. Coal Gas matches with 4 Hydrogen, Methane, Carbon Monoxide. C. LPG matches with 2 Butane, Propane. D. Water Gas matches with 1 Carbon Monoxide, Hydrogen.

This corresponds to the sequence 3 4 2 1.