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Basicity of Aromatic Amines -
The unshared pair of electrons at the nitrogen atom is in resonance with the benzene ring and hence not fully available for donation as in the case of aniline.
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Nature of group and basicity -
Electron withdrawing groups ( -I and -M effect ) decreases basicity, whereas Electron releasing groups ( +I and +M effect ) increases basicity.
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But 3rd N is most
Option 1)
Option 2)
Option 3)
Option 4)