Multiple choice

Which of the following is a component of biogas and compressed natural gas (CNG)?

  1. C2H2

  2. CH4

  3. C2H6

  4. C2H4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Methane (CH4) is the primary component of both biogas (50-75%) and compressed natural gas (CNG, 90%+). It's a simple hydrocarbon and clean-burning fuel. Options A, C, and D are other hydrocarbons (acetylene, ethane, ethylene) but are not major components of these gas mixtures. Option B (CH4) is correct.

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