Organic Chemistry

SOLUTION E10.3c

Both protonated amines with double bonds have resonance stabilization of their conjugate bases (the neutral amine species), which makes them stronger acids than the other two. The species with two double bonds would be aromatic as the neutral amine (conjugate base), which makes it the weakest of the bases, and thus, its protonated amine is the strongest acid. The weakest acid is the neutral amine, as its conjugate base would be an anion, relative to the rest which have neutral amines as conjugate bases.

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