Which of the following is the major constituent of the liquefied petroleum gas?

Correct answers: (d) Butane or (e) None of the above/More than one of the above

Explanation

LPG (Liquefied Petroleum Gas) is mainly a mixture of butane and propane, with butane as the larger part.

The Commission’s final key took option (e), since LPG has more than one major constituent; butane alone, option (d), is also accepted here.

Ethyl mercaptan is added to give it a smell for leak detection; methane is the chief component of natural gas, not LPG.