The stench due to leakage from LPG cylinder is because of A. Methane B. Propane C. Butane D. Ethyl mercaptan

The correct answer is D. Ethyl mercaptan.

Ethyl mercaptan is a chemical compound with the formula C2H5SH. It is a colorless, flammable liquid with a strong, unpleasant odor. It is used as a warning agent in natural gas and propane to detect leaks.

Methane, propane, and butane are all gases that are used in LPG. They are all odorless, so they would not be able to be detected by their smell if there was a leak.

Ethyl mercaptan is added to LPG to make it smell bad so that leaks can be detected. If you smell a strong, unpleasant odor, it is important to evacuate the area and call the gas company immediately.