LPG is mainly a mixture of two hydrocarbons:

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Butane + ethane

Butane + isobutane

Propane + butane

Methane + ethane

answer is C.

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Detailed Solution

Concept- LPG stands for liquefied petroleum gas. It is a fossil fuel, which implies it is a non-renewable energy source. It is usually derived from crude oil or natural gas.
It burns quickly in the air and has almost the same energy content as gasoline, with twice the heat energy of natural gas. As a result, LPG is a great cooking, heating, and automobile fuel. It is made up mostly of hydrocarbons with three or four carbon atoms. Propane and butane are the most basic components. Other hydrocarbons in trace amounts may also be present.
Hence, the correct option is 3.

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