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ChemistryNEET 2025Basicity of amines

Amines

The correct order of decreasing basic strength of the given amines is:

  1. A.N-methylaniline > benzenamine > ethanamine > N-ethylethanamine
  2. B.N-ethylethanamine > ethanamine > benzenamine > N-methylaniline
  3. C.N-ethylethanamine > ethanamine > N-methylaniline > benzenamine✓
  4. D.benzenamine > ethanamine > N-methylaniline > N-ethylethanamine

Solution

Aliphatic amines are stronger bases than aromatic ones because the aryl lone pair is delocalised into the ring. Among aliphatic amines, the secondary N-ethylethanamine beats primary ethanamine (inductive effect plus solvation balance); among aromatic ones, the N-methyl group makes N-methylaniline slightly stronger than aniline. Order: N-ethylethanamine > ethanamine > N-methylaniline > benzenamine.

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