Correct Answer:
C. Methane.
The main component of biogas is Methane (CH₄). Biogas is a renewable fuel produced from the anaerobic digestion of organic matter, such as agricultural waste, animal manure, municipal waste, and sewage. During this process, microorganisms break down organic materials in the absence of oxygen, leading to the production of a gas mixture. Methane typically constitutes 50-75% of biogas by volume, with carbon dioxide being the second most prevalent gas. The high methane content is what gives biogas its combustible properties, making it a valuable energy source that can be used for electricity generation, heating, or as vehicle fuel, serving as a sustainable alternative to fossil fuels.
- Propane: Propane (C₃H₈) is a liquefied petroleum gas (LPG) and is a fossil fuel, not a significant component of biogas. It is produced primarily from crude oil refining and natural gas processing.
- Butane: Butane (C₄H₁₀) is another LPG, similar to propane, and is also derived from fossil fuel sources. It is not a product of anaerobic digestion and therefore not a main component of biogas.
- Ethane: Ethane (C₂H₆) is a gaseous hydrocarbon found in natural gas, but it is typically present in only trace amounts in biogas, far from being its main component. M