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Aniline is a weaker base than ammonia mainly because

  1. Athe nitrogen of aniline is sp3 hybridised while that of ammonia is sp2
  2. Baniline has no lone pair on nitrogen
  3. Cthe phenyl group has a +I effect that pushes electron density away from nitrogen
  4. Dthe lone pair on nitrogen is delocalised into the benzene ring by resonance

Answer: D

In aniline the nitrogen lone pair overlaps with the pi system of the ring and is partly delocalised (resonance), so it is less available to accept a proton. The phenyl group is also electron-withdrawing (-I) by inductive effect, not +I. Hence aniline is a weaker base than ammonia.
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