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a
(I and (III) are modest Bronsted bases whereas (II) is not.
b
In (III) Na is more basic than Nb.
c
When (II) is protonated in the presence of a strong acid, protonation occurs at C-2.
d
All the nitrogen present in (I), (II), and (III) is sp2 hybridised.
answer is A.
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Detailed Solution
So, Nb is more basic due to the presence of LP e-'s.Hence, the statement (2) is wrong.Statement (3) is true.Statement (4): Due to resonance all the N in I, II, and III is sp2hybridised and hence the statement is true.