The compound which on reaction with aqueous nitrous acid $(HNO_2)$ at low temperature produces an oily nitrosoamine is

How will you carry out the following conversion: $p$-nitroaniline to $3,4,5$-tribromonitrobenzene?

Which from the following amines has the highest $pK_{b}$ value?

In the reaction sequence $A$ $\xrightarrow{Sn/HCl} B$ $\xrightarrow{HNO_2, 0^{\circ}C} C$ $\xrightarrow{C_2H_5OH} C_6H_6$,identify the functional groups present in $A, B,$ and $C$.

Predict the major product $P$ in the following reaction.

Explain the carbylamine reaction.