Briefly explain the difference in the Pk_bs of aniline and pyrrole.

Question

Question

Answer 1

Answer #1

aniline has a PRIMARY amine, the nitrogen has a lone pair, therefore it can attract easily the Hydrogen H+ ion, and become a base ( H+ acceptor)

for pyrole, the electrons are being used in the resonance structure of the ring, so they are not as free to attract H+ ions

therefore pKb is much lower

Answer 2

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