Correct Option
Compressed Natural Gas (CNG) primarily consists of methane (CH₄) and smaller proportions of ethane (C₂H₆).
Coal Gas, a gaseous fuel obtained from coal, contains major constituents such as hydrogen (H₂), methane (CH₄), and carbon monoxide (CO).
Liquefied Petroleum Gas (LPG) is mainly composed of butane (C₄H₁₀) and propane (C₃H₈), serving as a common fuel for domestic and industrial applications.
Water Gas is a mixture of carbon monoxide (CO) and hydrogen (H₂), typically produced by passing steam over hot carbon.
Incorrect Options
Options 1, 3, and 4 present incorrect pairings:
- Option 1 incorrectly matches CNG with Butane, Propane (A-2) and LPG with Methane, Ethane (C-3).
- Option 3 incorrectly matches CNG with Butane, Propane (A-2) and LPG with Methane, Ethane (C-3).
- Option 4 incorrectly matches Coal Gas with Carbon monoxide, Hydrogen (B-1) and Water Gas with Hydrogen, Methane, Carbon monoxide (D-4).