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 |
| A. CNG | 1. Carbon monoxide, Hydrogen |
| B. Coal gas | 2. Butane, Propane |
| C. LPG | 3. Methane, Ethane |
| D. Water gas | 4. Hydrogen, Methane, Carbon monoxide |
Codes:
(a) A-2; B-1; C-3; D-4 (b) A-3; B-4; C-2; D-1
(c) A-2; B-4; C-3; D-1 (d) A-3; B-1; C-2; D-4
(b) Compressed natural gas (CNG) is made by compressing natural gas which is composed of methane (CH4), it also contain small amount of ethane. Coal gas typically contains hydrogen, methane and carbon monoxide.
LPG is the abbreviation or short form of Liquefied Petroleum gas. The major constituents of LPG is propane and butane.
Water gas is a synthesis gas, containing carbon monoxide and hydrogen.