A nitro-compound among the following that does not react with nitrous acid is:

1.		2.
3.		4.

A nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO₂ to give an unstable compound B. On treatment with phenol, B forms a beautiful coloured compound C with the molecular formula C₁₂H₁₀N₂O. The structure of compound A is:

1.		2.
3.		4.