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(i) Illustrate the following reactions : (a) Hoffmann bromamide degradation reaction. (b) Coupling reaction. (ii) Write a chemical test to distinguish between aniline and methylamine. |
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Answer» Solution :(i) Reactions for the reactions are given as under : (a) HOFFMANN bromamide degradation reaction : `R-overset(overset(O)(||))(C)-NH_(2)+Br_(2)+4NaOH rarr R-NH_(2)+Na_(2)CO_(3)+2NaBr+2H_(2)O` Hoffmann bromamide degradation reaction is used to convert an amide into amine. (b) Coupling reaction : This reaction takes PLACE between benzene DIAZONIUM chloride and phenol as under :  (ii) Chemical test to distinguish between aniline and METHYLAMINE : Aniline gives dye test while methylamine does not give this test. Aniline solution is treated with a solution of `NaNO_(2)` and HCl. It is cooled to `5^(@)C` and treated with a solution of phenol. An orange dye is obtained. METHYL amine does not give this test. |
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