Liquid petroleum gas is commonly known as which hydrocarbon used as fuel?

• A. Butane
• B. Propane
• C. Methane
• D. Ethane

Answer: (B)

Liquefied petroleum gas is a fuel that is stored as a liquid under pressure, making it convenient for portable tanks and grills. The hydrocarbon most commonly associated with LPG and used as fuel is propane. Propane is a three-carbon compound (C3H8) that readily liquefies under modest pressure, delivering good energy density when stored as a liquid and then vaporizes to burn cleanly in appliances. While LPG can contain some butane as well, propane is the standout component people think of when they hear LPG, which is why it’s the best answer here. Methane and ethane are lighter hydrocarbons used in other contexts (natural gas and petrochemical feedstocks, respectively) and aren’t the primary fuels people refer to with LPG.