in this question 3 sould be most basic as 2 e- donating groups and also 2 supportive resonance effct then 1 as l.p. not involved in resonance then 4 as l.p.does not contribute to aromaticity than 2 but my ans. is not in option correct option given is 1

Dear Student,

The answer given by you is correct. 
Pyridine is more basic than aniline because the lone pair on N in aniline is delocalised over the ring and is not available for donation, making it less basic than pyridine which contains a lone pair of N for donation. The lone pair of electron in pyridine is not delocalised over the ring. So, the order must be III > I > IV> II. 

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