Major constituent of LPG is:

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Ethene

Butane

Propane

Pentane

answer is B.

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Detailed 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

C 4 H 10

.
Hence, the correct option is (2).

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