The basicity of amines is a Lewis basic character that is the electron-donating capacity of nitrogen in the above structures. Now Pyrrole (A), Pyridine ((B), and Aniline (D) structures are aromatic compounds obeying Huckel's rule and delocalization of pi electrons. In all of these Lone pair of electrons of nitrogen is delocalized with pi electron cloud of the aromatic ring. But in hexa-hydro pyridine (B) the Lone pairs are on nitrogen and can be donated
Thus B is most basic out of all
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Ans. is "B".
Reason : 'C' is out of compairision so remaining options are either A,B or D.
Well in A option Nitrogen's lone pair will take participation in resonance with double bond and in D option Nitrogen's lone pair will take participation in resonance with benzene ring , so they will not be available for donation {since basic chr is directly proportional to nature of donation of lone pair}
But in option "B" Nitrogen's lone pair are localised so they don't participate in resonance, which in return make them more available for donation which again in return increases the basic character
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