Which one of the following is a strong smelling agent added to LPG cylinders to help in the detection of gas         leakages ?

IUPAC (International Union of Pure and Applied Chemistry) name for the chemical is Ethanethiol. Alternate name for the substance is Ethyl Mercaptan.
It is a colorless gas or clear liquid with a distinct odor.
Ethanethiol is toxic. It occurs naturally as a minor component of petroleum, and may be added to otherwise odorless gaseous products such as liquefied petroleum gas (LPG) to help warn of gas leaks.
At these concentrations, ethanethiol is not harmful.

By: kamaljeet kaur