When chemists convert ethene (C2H2) to ethanol (CH3CH2OH), they have a mixture of the two gaseous substances. Why do chemists then lower the temperature of the mixture?

Cooling the mixture makes the substance with the higher boiling point condense first. Ethanol molecules form hydrogen bonds, which attract them strongly and allow ethanol to become liquid while ethene remains gaseous at the same temperature. Thus, the mixture can be separated by collecting liquid ethanol; choice C gives the correct substance and reason.

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