Write the chemical equations for one example of each of the following :
(a) Coupling reaction`" "`(b) Hoffmann's bromamide reaction
(c) Acetylation.

Explanation

(a) Coupling reaction :

(b) Hoffmann.s bromamide reaction :
`underset("Ethanamide")(CH_(3)-overset(overset(O)(||))(C)-NH_(2))+Br_(2)+4KOH rarr underset("Methanamine")(CH_(3)NH_(2))+K_(2)CO_(3)+2KBr+2H_(2)O`
(c) Acetylation :
When aniline reacts with acetyl chloride in the presence of NaOH, we get acetanilide. This process is called acetylation.