A) bromine
B) fluorine
C) chlorine
D) sulphur
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The correct answer is D) sulphur
The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of sulphur.
This organic sulphur compound has a distinct smell which is used to detect the leakage of otherwise odourless LPG cooking gas. It is not composed of bromine, fluorine or chlorine.
Therefore, the answer to the question is D) sulphur.