The minor product formed when aniline is heated with concentrated ${\mathrm{HNO}}_3+$concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$  at $288\mathrm{K}$:

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 $\mathrm{Z}$?

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}\stackrel{\mathrm{NaCN}}{\to } \mathrm{x} \stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }\mathrm{y} \underset{\mathrm{anhydride}}{\overset{\mathrm{Acetic}}{\to }}\mathrm{z}$ 

Identify $\mathrm{z}$ in the above reaction, from the following.

Aniline $\stackrel{\mathrm{X}}{\to }$ Acetanilide 

In the above reaction, $\mathrm{X}$ is

What is the alkene formed as a major product in the above elimination reaction?

Identify $\mathrm{X}$ in the following reaction.