(i) The loss of a proton from an amine gives an imide ion, while the loss of a proton from alcohol gives an alkoxide ion as shown below:
RAmine−NH2⟶R−⊖NHImideion+H⊕
R−O−H⟶R−O⊖+H⊕
Since O is more electronegative than N, therefore, (⊖RO) can accomodate the negative charge more easily than R⊖NH can accomodate the negative charge.
In other words, RO⊖ is more stable than R⊖NH. Thus, alcohols are more acidic than amines. Conversely, amines are less acidic than alcohols.
(ii) 1o amines form stronger intermolecular H-bonding between N atom of one and H atom of another molecule.
(iii) Aliphatic amines are stronger bases due to the +I effect of the alkyl group, leading to high electron density on the N atom.