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Amines — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryAmines1 Mark
MCQ
Identify the statement about the basic nature of amines.
  • A
    Alkylamines are weaker bases than ammonia.
  • B
    Arylamines are stronger bases than alkyl amines.
  • ✓
    Secondary aliphatic amines are stronger bases than primary aliphatic amines.
  • D
    Tertiary aliphatic amines are weaker bases than arylamines.
✓

Answer

Correct option: 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.

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