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a
All the nitrogen present in (I), (II), and (III) is sp2 hybridised.
b
In (III) Na is more basic than Nb.
c
(I and (III) are modest Bronsted bases whereas (II) is not.
d
When (II) is protonated in the presence of a strong acid, protonation occurs at C-2.
answer is A, C, D.
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