Q. 2 A4.4( 12 Votes )
Give one chemical test to distinguish between the following pairs of compounds.
Methylamine and dimethylamine
The best test for distinguishing methyl amine and dimethylamine is the Carbylamines test.
Carbylamine Test: Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium hydroxide form foul-smelling isocyanides or carbylamines.
In this case, Methylamine (which is an aliphatic primary amine) gives a positive carbylamine test while dimethylamine wont.
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(a) Write the reactions involved in the following :
(i) Hofmann bromamide degradation reaction
(iii) Gabriel phthalamide synthesis
(b) Give reasons :
(i) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
(ii) Aromatic diazonium salts are more stable than aliphatic diazonium salts.
(a) Write the structures of the main products of the following reactions:
(b) Give a simple chemical test to distinguish between Aniline and N,N-dimethylaniline.
(c) Arrange the following in the increasing order of their pKb value:
C6H5NH2, C2H5NH2, C6H5NHCH3Chemistry - Board Papers