Question

Identify the statement about the basic nature of amines.

• A. Alkylamines are weaker bases than ammonia
• B. Arylamines are stronger bases than alkyl amines
• C. Secondary aliphatic amines are stronger bases than
  primary aliphatic amines
• D. Tertiary aliphatic amines are weaker bases than
  arylamines

Answer 1

The correct option is C Secondary aliphatic amines are stronger bases than

primary aliphatic amines
The lone pair of the electron on nitrogen atom present is arylamines is less available for protonation partly due to -I effect of a phenyl group and mostly due to resonance. Hence aryl amines are weaker bases than alkyl amines.

Also, the secondary amines are a stronger base than the primary amines as the number of alkyl groups attached to the nitrogen atoms are more in secondary alkyl amines.