A particular colorless organic liquid is known to be one of the following
compounds: 1-butanol, diethyl ether, methyl propyl ether, butyraldehyde, or
propionic acid. Can you identify which it 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 \(-0.7^{\circ} \mathrm{C}\). (2) An
aqueous solution of the liquid does not change the color of blue litmus paper.
(3) When alkaline \(\mathrm{KMnO}_{4}(\) aq) is added to the liquid and the
mixture is heated, the purple color of the \(\mathrm{MnO}_{4}^{-}\) disappears.