Reduction with iron scrap and hydrochloric acid is preferred because
FeCl2 formed gets hydrolysed to release hydrochloric acid during the
reaction Thus, only a small amount of hydrochloric acid is required
to initiate the reaction 2 Ammonolysis of alkyl halides
You have read (Unit 6, Class XII) that the carbon - halogen bond in
alkyl or benzyl halides can be easily cleaved by a nucleophile