Push-Pull Resonance. The Basicity of para-Nitroaniline

Push-Pull Resonance. The Basicity of para-Nitroaniline 

Compare the geometry of para-nitroaniline to those of both aniline and nitrobenzene. Is there any evidence for push-pull resonance contributors Is there shortening of bonds to the amino and nitro groups Are the bonds in the ring localized Is the dipole moment for para-nitroaniline smaller, larger or about the same as the sum of the dipole moments for aniline and nitrobenzene What does your result say about the importance of push-pull resonance contributors  

Electro.static potential map for para-nitroaniline shows negatively-charged regions (in red) and positively-charged regions (in blue). 

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