Assignment

$4$-Nitro- $\mathrm{N}, \mathrm{N}$-dimethyl benzenamine is

The above reaction sequence $\left(\mathrm{D}\right)$ is

The product $\mathrm{A}$ will be

The IUPAC name of $\mathrm{NC}-{\mathrm{CH}}_2{\mathrm{CH}}_2-\mathrm{COOH}$ is

Which reactants are involved in Mendius reaction?

Stephen's reduction will convert  to

Methyl isocyanate, the poisonous gas which was responsible for Bhopal tragedy in $1984$, on alkaline hydrolysis gives

$\mathrm{R}-\mathrm{CN}\underset{(\mathrm{Complete} \mathrm{hydrolysis})}{\overset{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }}\mathrm{X}\underset{∆}{\overset{{\mathrm{NH}}_3}{\to }}\mathrm{Y}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) {\mathrm{Br}}_2+\mathrm{KOH}}{\to }}\mathrm{Z}$ Identify $\mathrm{Z}$.