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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
Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?
The decreasing order of reactivity of $m-$ nitrobromobenzene $(I), 2, 4, 6-$ trinitrobromo-benzene $(II), p-$ nitrobromobenzene $(III)$, and $2,4-$ dinitrobromobenzene $(IV),$ towards $OH^-$ ions is