Write short notes on :
(i) Coupling reaction
(ii) Ammonolysis

Explanation

(ii) Ammonolysis : `R-X + NH_(3) rightarrow R-NH_(2)+HX`
`RNH_(2) + R-X rightarrow (R_(2))N + HX`
`(R_(2))NH + R -X rightarrow (R_(3))N+HX`
`(R_(3)N + R-X rightarrow [R_(4)N]^oplusX^(-))`.