Why are aliphatic amines stronger bases than aromatic amines?

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Solution

In aliphatic amines, the $- N H_{2}$ group is attached to an alkyl group which is an electron donating group i.e, they have $+ I$ effect. So, the lone pair of electrons on nitrogen are readily available.
In aromatic amines, the $- N H_{2}$ group is attached to a $- C_{6} H_{5}$ group, which is an electron withdrawing group. So, the availability of a lone pair of electrons on $N$ is decreased. Therefore aliphatic amines are more basic than aromatic amines.

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Why are aliphatic amines stronger bases than aromatic amines?

Give plausible explanation for each of the following:

(i) Why are amines less acidic than alcohols of comparable molecular masses?

(ii) Why do primary amines have higher boiling point than tertiary amines?

(iii) Why are aliphatic amines stronger bases than aromatic amines?

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