1.

(a) How is methanamine prepared by Hoffmann bromamide degradation reaction? Give equation.(b) How is aniline converted to Benzene diazonium chloride? Give equation.(c) Between ammonia and aniline, which is more basic?

Answer»

Solution :(a) Hoffmann.s bromamide reaction: When an ACID amide is heated with bromine and potassium hydroxide solution, a primary amine is obtained.
`R-CONH_(2) +Br_(2) + 4KOH overset(Delta)toR-NH_(2) +K_(2)CO_(3) +2KBr + 2H_(2)O and R = CH_(3)`.
(b)When primary arylamine REACT with nitrous acid at low temperature (273 - 278 K) to give aromatic DIAZONIUM salts. This reaction is known as diazotisation. Nitrous acid being unstable is prepared in situ by the reaction of sodium nitrate and dilute mineral acid.
(b)
( c)Ammonia.


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