Arrange the following compounds in their order of decreasing solubility in water. Place the identifying letter of the most soluble compound on the left and arrange the other letters after it in correct order. Explain the order chosen. Be sure to indicate the key feature that determines the relative solubility of each molecule.

CH3CH2CH2COOH CH3OCH2CH2CH3 CH3CH2CH2CH3 CH3CH2OH

A B C D

Order of decreasing solubility: _____ _____ _____ _____