Which of the following carbon compounds is a major component of biogas and compressed natural gas?

Correct option is A

The correct answer is (A) Methane.

Methane (CH₄) is the primary carbon compound in both biogas and compressed natural gas (CNG). 

Explanation:

• Methane is a colorless, odorless, tasteless, and highly flammable gas. 
• It's produced by methanogenic organisms in landfills. 
• Methane is also found in cow dung. 
• It can be used as a fuel in fuel cells to generate electricity. 
• When burned in the presence of enough oxygen, methane produces energy. 
• Methane is a greenhouse gas that's 20 times more powerful than carbon dioxide. 

Additional information:

• Butane is a hydrocarbon and a highly flammable, colourless, odourless, easily liquefied gas. It is typically used as fuel for cigarette lighters and portable stoves, a propellant in aerosols, a heating fuel, a refrigerant, and in the manufacture of a wide range of products.
• Ethane is an important constituent of natural gas and a primary gaseous fuel in the petrochemical industry. Under normal temperature and pressure conditions, ethane remains colourless, odourless, and is a highly flammable gas. 
• Propane is a three-carbon alkane gas (C₃H₈). It is stored under pressure inside a tank as a colorless, odorless liquid. As pressure is released, the liquid propane vaporizes and turns into gas that is used in combustion. An odorant, ethyl mercaptan, is added for leak detection.