What is obtained when nitrobenzene is treated sequentially with $(i)$ $NH_4Cl / Zn$ dust and $(ii)$ $H_2SO_4 / Na_2Cr_2O_7$?

The colour of $p$-amino azobenzene is

$4$-Methylaniline on heating with alcoholic $KOH$ in the presence of chloroform gives :-

Which of the following reactions does not involve the Hoffmann Bromamide degradation?

Acetic acid on heating with $NH_3$ forms $A$. When $A$ reacts with $LiAlH_4$ followed by hydrolysis,it gives $B$. When $B$ is heated with chloroform in $KOH$ medium,it gives $C$. What are $B$ and $C$ respectively?

The final product $C$ in the following series of reactions is: