Arrange the following compounds as directed: (i) In increasing order of solubility in water: $(\mathrm{CH}_3)_2\mathrm{NH}, \mathrm{CH}_3\mathrm{NH}_2, \mathrm{C}_6\mathrm{H}_5\mathrm{NH}_2$ (ii) In decreasing order of basic strength in aqueous solution : $(\mathrm{CH}_3)_3\mathrm{N}, (\mathrm{CH}_3)_2\mathrm{NH}, \mathrm{CH}_3\mathrm{NH}_2$ (iii) In increasing order of boiling point: $(\mathrm{C}_2\mathrm{H}_5)_2\mathrm{NH}, (\mathrm{C}_2\mathrm{H}_5)_3\mathrm{N}, \mathrm{C}_2\mathrm{H}_5\mathrm{NH}_2$