The major constituent of natural gas is:

A. methane

B. propane

C. butane

D. hexane

• Natural gas is mainly methane, with smaller amounts of higher alkanes and traces of CO₂, N₂, H₂S, or helium.
• It is a non-renewable fuel.
• Methane makes up about 70–90%, so natural gas is nearly pure methane: colorless and highly flammable.
• Minor components include propane, butane, hexane, etc.
• Therefore, methane is the major component of natural gas.
• Options B, C, and D are incorrect.
• Typical impurities may include ~8% carbon dioxide, ~0.2% oxygen, and ~5% nitrogen (values vary by source).

Correct answer: Option A.