Question

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?

Answer 1

Answer:

Hence, amines are less acidic than alcohols of comparable molecular masses. ... Hence, primary amines have higher boiling points than tertiary amines. (iii) Due to the −R effect of the benzene ring, the electrons on the N- atom are less available in case of aromatic amines.

Answer 2

Hey Dear,

◆ Answers with explaination -

(i) Due to less polarity of N-H bond, release of proton (H+) is harder in case of amines. Therefore, amines are less acidic than alcohols.

(ii) Primary amines are more strongly bonded by hydrogen bonding. Hence, boiling point of primary amines is more than that of tertiary amines.

(iii) Addition of proton to aromatic amines is less stabilized by resonance. On the other hand, addition of proton to aliphatic amines is well-stabilized by positive inductive effect. Hence, aliphatic amines are stronger bases than aromatic amines.

Thanks dear...