Multiple choice Which of the following are the major constituents of LPG? Methane and ethane Hydrogen, methane and carbon monoxide Hydrogen and carbon monoxide Butane and propane Reveal answer Fill a bubble to check yourself D Correct answer Explanation LPG, or Liquefied Petroleum Gas, is primarily composed of hydrocarbons that are easily liquefied under pressure. The major constituents are propane and butane.