While filling LPG in cylinders, a substance $X$ is added to make the detection of leakage of LPG from the cylinder easy. The substance $X$ is

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Ethanol

Ethyl mercaptan

Methenethiol

Methanol

answer is B.

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Detailed Solution

The substance

X

is Ethyl mercaptan.
LPG is mainly composed of propane and butane, and it is completely odourless in its natural state. It is produced by refining petroleum or natural gas. It is kept liquid by applying high pressure.
The odour we detect while filling LPG cylinders and during leakage is caused by an entirely different agent known as Ethyl Mercaptan.
Ethyl Mercaptan is a clear colourless liquid with a chemical odorant that is added to LPG as it leaves the main storage terminals to easily detect LPG leakage.

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