The stench due to leakage from LPG cylinder because of:

Correct answer: (d) Ethyl mercaptan

Explanation

LPG is mainly propane and butane, which are odourless in their natural state.

A strong-smelling ethyl mercaptan (C₂H₅SH) is deliberately added so leaks can be detected by smell.

Methane is the chief component of natural gas, not LPG.