Step 1: Understanding the Concept:
Liquefied Petroleum Gas (LPG) is a common fuel gas used for heating, cooking, and in vehicles. The question asks for its primary chemical components.
Step 2: Detailed Explanation:
1. LPG is a flammable mixture of hydrocarbon gases obtained as a by-product of petroleum refining and natural gas processing.
2. The main components of LPG are propane (C$_3$H$_8$) and butane (C$_4$H$_{10}$).
3. The exact composition varies depending on the source and season, but it is typically a mix of these two gases. Butane includes both n-butane and its isomer, isobutane.
4. These gases are easily liquefied under moderate pressure at room temperature, which allows them to be stored and transported in liquid form in pressurized containers.
Let's analyze the options:
- (A) Methane, Ethane: Methane (CH$_4$) is the primary component of natural gas (CNG - Compressed Natural Gas), not LPG.
- (B) Ethane, Propane: While propane is a major component, ethane (C$_2$H$_6$) is not a primary constituent of LPG.
- (C) Butane, Isobutane: Butane and its isomer isobutane are the main components of LPG, often mixed with propane. This is the most accurate description among the choices.
- (D) Ethene, Ethyne: These are unsaturated hydrocarbons (alkenes and alkynes) and are not the main components of LPG.
Step 3: Final Answer:
LPG mainly contains butane and isobutane (along with propane). Therefore, option (C) is the best choice.