How many isomers of $C_4H_{11}N$ are tertiary amines?

Explain the chemical reactions of benzene-diazonium chloride.

Identify $A$ and $B$ in the following reaction sequence:
$C_6H_5NH_2 + CH_3COCl$ $\rightarrow A$ $\xrightarrow{Br_2/H_2O} B$

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

The reaction between a primary amine,chloroform and a few drops of alcoholic $KOH$ is known as:

The order of decreasing nucleophilicity of the following is: