(1) From butane nitrile :
When butane nitrile is reduced by sodium and ethanol, it gives propan-l-amine.
(2) From 1-nitropropane :
When 1-nitropropane is reduced in the presence of tin and cone, hydrochloric acid, propan-l-amine is obtained.
(3) From propanamide :
When propanamide is reduced in the presence of lithium aluminium hydride, propan-l-amine is obtained.
(4) From butanamide :
When butanamide is treated with bromine and aq. KOH, propan-l-amine is obtained.
