Question

LPG contains mostly:

• A. Methane, Ethane, and Propane
• B. Ethane, Propane, and Butane
• C. Propane, Butane, and Isobutene
• D. Methane

Hint:

LPG is mainly a mix of propane and butane. Always remember: methane is natural gas, not LPG.

Answer 1

The Correct Option is C

LPG stands for Liquefied Petroleum Gas, which is a flammable mixture of hydrocarbon gases that is commonly used as fuel in heating appliances, cooking equipment, and vehicles.
The primary components of LPG are:
- Propane (C$_3$H$_8$)
- Butane (C$_4$H$_{10}$)
- Isobutane (a branched isomer of butane) or Isobutene (C$_4$H$_8$) depending on the refining process and source
These gases are stored in liquid form under pressure and vaporize when the pressure is released, making them easy to transport and use.
Let’s evaluate the incorrect options:
- Option (1): Methane and ethane are not major components of LPG. Methane is the main component of natural gas, not LPG.
- Option (2): Ethane is again more associated with natural gas. While propane and butane are correct, the presence of ethane makes this option inaccurate.
- Option (4): Methane alone cannot constitute LPG—it is a separate fuel gas.
Hence, Option (3) is correct as LPG is primarily composed of propane, butane, and small quantities of isobutene.