Chapter 26, Problem 84IAE

A particular colorless organic liquid is known to be one of the following compounds: butan-1-ol diethyl ether, methyl propyl ether, butyraldehyde, or propionic acid. Can you identify which t is, based on the following tests? If not, what additional test would you perform? (1) A 2.50 g sample dissolved in 100.0 g water has a freezing point of—O.7 °C. (2) An aqueous solution of the liquid does not change the color of blue litmus paper. (3) When alkaline $KMn{O}_4$ (aq) is added to the liquid and the mixture is heated, the purple color of the $Mn{O}_4{}^{-}$ disappears.