Which of the following would be among the products of the reactions between ammonia reacts with bromoethane?

$$\begin{gathered} \left(\mathrm{i}\right) {\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NH}}_2 \\ \left(\mathrm{ii}\right) ({\mathrm{CH}}_3{\mathrm{CH}}_2{)}_2\mathrm{NH} \\ (\mathrm{iii}) ({\mathrm{CH}}_3{\mathrm{CH}}_2{)}_3\mathrm{N} \\ \left(\mathrm{iv}\right) ({\mathrm{CH}}_3{\mathrm{CH}}_2{)}_4\mathrm{N}{ }^{+}{\mathrm{Br}}^{-} \end{gathered}$$

What are $\mathrm{P}$ and $\mathrm{Q}$ in the following reactions?

Starting from propanoic acid, the following reactions were carried out 
Propanoic acid $\stackrel{{\mathrm{SOCl}}_2}{⟶}\mathrm{X}\stackrel{{\mathrm{NH}}_3}{⟶}\mathrm{Y}⟶{\mathrm{Z}}_2+\mathrm{KOH}\to \mathrm{Z}$

What is the compound $\mathrm{Z}$?

In the reaction, 

${\mathrm{CH}}_3·{\mathrm{CH}}_2·\mathrm{Cl}\stackrel{\mathrm{KCN}}{⟶}\left(\mathrm{A}\right)\stackrel{{\mathrm{LiAlH}}_4}{⟶}\left(\mathrm{P}\right)$ end product $\left(\mathrm{P}\right)$ is

Identify $\text{'}\mathrm{A}\text{'}$ in the following reaction $\mathrm{R}-{\mathrm{NO}}_2\underset{\mathrm{neutral} \mathrm{medium} }{\overset{\mathrm{Zn}/{\mathrm{NH}}_4\mathrm{Cl}}{\to }}\mathrm{A}+{\mathrm{H}}_2\mathrm{O}$