(a) How will you distinguish between the following pairs of compounds?
(i) aniline and ethanamine
(ii) aniline and N-methylaniline
(b) Arrange the following compounds in decreasing order of their boiling points: butanol, butanamine, butane.
(i) aniline and ethanamine
(ii) aniline and N-methylaniline
(b) Arrange the following compounds in decreasing order of their boiling points: butanol, butanamine, butane.
Solution
(a)(i) Diazotise cold and add alkaline β-naphthol: aniline → orange azo dye; ethanamine → N bubbles only.
(ii) CHCl/alc. KOH: aniline (1°) → foul CHNC; N-methylaniline (2°) → nothing.
(b) O–H···O bonds > N–H···N bonds > van der Waals:
(ii) CHCl/alc. KOH: aniline (1°) → foul CHNC; N-methylaniline (2°) → nothing.
(b) O–H···O bonds > N–H···N bonds > van der Waals:
CBSE Class 12 Board · 2020 · Subjective