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Hoffmann bromamide degradation reaction of an amide gives a primary amine having one carbon atom less than that of the amide taken.
Reduction of amides using lithium aluminium hydride yields corresponding amines with same number of carbon atoms.
For preparation of amines having one carbon atom more than the starting alkyl halide, conversion to nitrile followed by reduction is carried out.
Reduction of niroalkanes/arenes using Sn or Fe in acid medium will give corresponding amine.