1.

Givingan example of each, describe the following reactions : (i) Hoffmann's bromamide reaction. "" (ii) Gatterman reaction. (iii) A coupling reaction.

Answer»

Solution :(i) Hoffmann.s bromamide reaction : <BR> `underset("Ethanamide")(CH_(3)-overset(overset(O)(||))(C)-NH_(2))+Br_(2)+4NaOH rarr underset("Methanamine")(CH_(3)NH_(2))+Na_(2)CO_(3)+2NaBr+2H_(2)O`
The amine obtained contains one carbon atom less than the amide taken.
(ii) Gatterman reaction :
`""underset(underset("chloride")("Benzene diazonium"))(C_(6)H_(5)N_(2)^(+)Cl^(-)) overset(Cu//HCl)(rarr)underset("Chlorobenzene")(C_(6)H_(5)Cl+N_(2))+CuCl`
(iii) Coupline reaction :


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