Nitrosobenzene can be isolated from nitrobenzene under which of the following conditions?

The following two reactions give the same foul-smelling product $Z$. $C_2H_5Cl \xrightarrow{X} Z$ and $C_2H_5CONH_2 \xrightarrow{Br_2, NaOH} Y \xrightarrow{CHCl_3/ethanolic KOH, \Delta} Z$. $X$ and $Z$,respectively,are:

The reaction of $N$-ethylcyclohexanamine with excess $CH_3I$ yields a product. Identify the product.

In the following compounds,the order of basicity is as follows:

Find $B$ in the following reaction sequence:

In the following reaction,the product $(A)$ is a yellow dye. Identify $(A)$.