In the following compounds the order of basicity is as follows
A$IV > III > II > I$
B$III > I > II > IV$
C$II > III > I > IV$
D$I > III > II > IV$
AIEEE 2012, Difficult
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D$I > III > II > IV$
d
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A given nitrogen-containing aromatic compound $'A'$ reacts with $Sn/HCl,$ followed by $HNO_2$ to give an unstable compound $'B'$. $ 'B',$ on treatment with phenol, forms a beautiful coloured compound $'C'$ with the molecular formula $C_{12}H_{10}N_2O.$ The structure of compound $'A'$ is