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Which of the following hydrocarbon exists mostly in solid or liquid form under the earth surface?

1. Ethane
2. Methane
3. Pentane
4. Butane

Correct answer: Pentane

Solution

Pentane has a much higher boiling point than methane, ethane, or butane, so it is less volatile and more likely to exist as a liquid or solid under Earth’s surface. The lighter alkanes are gases under normal conditions and remain mostly gaseous underground.

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