Multiple choice

The compound of which of the following chemicals is added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas?

  1. Sulphur

  2. Fluorine

  3. Chlorine

  4. Bromine
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A Correct answer
Explanation

LPG (Liquefied Petroleum Gas) is naturally odorless, so sulfur-containing compounds like ethyl mercaptan (ethanethiol) or thiophane are added as odorants to make leaks detectable. These compounds have an extremely strong smell detectable at very low concentrations (as low as 1 part per billion). The sulfur in these compounds produces the characteristic 'rotten egg' smell.

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