Match List 1 (Gas) with List II (Main chemical composition) and select the correct answer using the codes given below the Lists

ListI | List II
A.  Water gas | 1. CH4
B.  Producer gas | 2. CO + H2
C.  Coal gas | 3. R, + CH4+CO
D .Gobargas | 4. CO + N2

The correct answer is Option 2 (A-2, B-4, C-3, D-1). This matching accurately reflects the chemical compositions of industrial and natural fuel gases:

• A. Water gas (2): Produced by passing steam over red-hot coke, it is a mixture of Carbon Monoxide (CO) and Hydrogen (H2). It has high calorific value.
• B. Producer gas (4): Formed by passing air over hot coke, it primarily consists of Carbon Monoxide (CO) and Nitrogen (N2). It is cheaper but has lower heating value due to nitrogen dilution.
• C. Coal gas (3): A byproduct of the destructive distillation of coal, its complex mixture includes Hydrogen (H2), Methane (CH4), and Carbon Monoxide (CO).
• D. Gobar gas (1): Also known as Biogas, it is produced by the anaerobic decomposition of organic matter; its primary combustible component is Methane (CH4).

Options 1, 3, and 4 are incorrect as they mismatch these fundamental chemical identities, particularly confusing the nitrogen-rich Producer gas with the hydrogen-rich Water gas.