Comparison Of Basicity Of Aryl Amines And Ammonia.

Question 1

Aryl amines is stronger or weaker base than ammonia?

Answer 1

Weaker

Question 2

Why is that aryl amines are less basic than ammonia?

Answer 2

In aryl amines ,the NH2 group is directly attached to the benzene ring ,so the lone pair of the nitrogen enter the benzene ring and undergoes resonance,so the e pairs are less available for protonation

Question 3

Describe about Aniline and basic nature .

Answer 3

Anilinium ion formed by accepting a proton undergoes resonance to form two resonance structure so it is not stable , therefore the Aniline does not easily accept a proton , therefore it is less basic

Question 4

In case of substituted aniline which group increases the basic strength ?

Answer 4

Electron releasing group such as
1)-OCH3
2)-CH3

Question 5

In case of substituted aniline which group decreases the basic strength ?

Answer 5

Electron withdrawing groups such as
1)-NO2
2) -SO3
3)-COOH
4)-X