question_answer 47)

  Among the following amines, the stronger Bronsted base is............... (a)                              (b)                                (c)                           (d)

Answer:

                  (d) Aniline is a weaker base than  due to delocalizadon of lone pair electrons on the N atom into the benzene ring. Pyrrole (c) is not at all basic because the lone pan: of electrons on the N-atom is donated towards aromadc sextet formation. Therefore, pyrrolidine (d) has a strong tendency to accept a proton and is hence it is the strongest Bronsted base.