Identify the substances A and B in each of the following sequences of reactions:

Identify the substances A and B in each of the following sequences of reactions:
CH₃CONH₂ is a weaker base than CH₃CH₂NH₂

183.

ROH is a stronger acid than RNH₂.

Show how p-amino azobenzene can be prepared from aniline?

Explain the following reactions by taking one suitable example in each case:
Hoffmann's bromamide reaction.

Explain the following reactions by taking one suitable example in each case:
Gattermann’s reaction.

How is ethylamine prepared from acetonitrile? Compare its basic character with that of ammonia.

How is aniline prepared commercially? Describe carbylamines test for primary amines.

Describe the method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.