Which of the following hydrocarbon exists mostly in the gaseous state under the earth surface?
A
Pentane
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B
Butane
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C
Hexane
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D
Octane
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Solution
The correct option is B Butane In its strictest sense, petroleum includes only crude oil, but in common usage, it includes all liquid, gaseous and solid hydrocarbons.Under surface pressure and temperature conditions, lighter hydrocarbons methane, ethane, propane and butane occur as gases, while pentane and heavier hydrocarbons are in the form of liquids or solids.