If$\text{'}\mathrm{x}\text{'}$ ${\mathrm{dm}}^3$ of ${\mathrm{N}}_2$ reacts with $\text{'}\mathrm{x}\text{'} {\mathrm{dm}}^3$ of ${\mathrm{H}}_2$to form ${\mathrm{NH}}_3$ under suitable conditions, then

The major product of the following reaction is :

Here, $\mathrm{Z}$ is:

The major products of the following reaction are :

In the following reaction the major product is

Fill up the blank:

$\mathrm{NaOH}+{\mathrm{H}}_2\mathrm{S}\to$ _____$+{\mathrm{H}}_2\mathrm{O}$  (Give the name of the compound formed)

In the following reaction sequence, structures of $\mathrm{A}$ and $\mathrm{B}$ are, respectively