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Straight-chain alkanes can be listed from lowest to highest boiling point as follows: methane (C1), ethane (C2), propane (C3), butane (C4), pentane (C5), hexane (C6), heptane (C7), octane (C8), nonane (C9), and decane (C10). As the number of carbon atoms increases, the boiling point tends to rise due to greater molecular weight and increased van der Waals forces.

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