Solution:
concept - LPG is a liquefied petroleum gas. It is the most commonly used gas for cooking, heating appliances and even in vehicles.The percentage composition of LPG is butane at 70 % and propane at 30 %. It is obtained from crude oil and natural gas.
LPG is very dangerous because if it leaks, it can cause terrible fires and destructive explosions. The smell you notice when there is a leak is actually an entirely different agent called Ethyl Mercaptan
Hence, the major constituent of LPG is butane. The chemical formula of butane is .
Hence, the correct option is (2).
