In the given reaction $A$ is :- $A$ $\xrightarrow{\text{Reduction}} B$ $\xrightarrow{HNO_2} C_2H_5OH$

The major product of the reaction shown below is:

What is the major product formed when ethylamine reacts with carbon disulfide $(CS_2)$ in the presence of mercuric chloride $(HgCl_2)$?

Identify the major products $X$,$Y$,and $Z$ in the following sequence of transformations:

How will you carry out the following conversions?
$(i)$ Toluene $\to$ $p$-toluidine
$(ii)$ $p$-Toluidine diazonium chloride $\to$ $p$-toluic acid

In the given reaction,what is the structure of the major product $X$?