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Rank the following compounds in terms of decreasing vapor pressure. Cl-CH2CH2OH CH3-O-CH3 CH3CH2OH CH3OH

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scme1702
The order is:
CH3-O-CH3
CH3OH
CH3CH2OH 
Cl-CH2CH2OH

This is because smaller molecules with weak intermolecular interactions will evaporate faster and exert larger vapor pressures.

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