Chlorobenzene reacts with trichloroacetaldehyde in the presence of ${\mathrm{H}}_2{\mathrm{SO}}_4$.

The major product formed is

What is the major product expected from the following reaction?

Where $\mathrm{D}$ is an isotope of hydrogen?

Bromination of cyclohexene under conditions given below yields:

Consider the reaction sequence below:

The major product of the following reaction is

Identify $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$ in the following synthetic scheme and write their structures.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{C}\equiv \mathrm{C}-\mathrm{H}\underset{(\mathrm{ii}) {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}}{\overset{ (\mathrm{i}) {\mathrm{NaNH}}_2}{\to }}\mathrm{X}\stackrel{{\mathrm{H}}_2/\mathrm{Pd}.{\mathrm{BaSO}}_4}{⟶}\mathrm{Y}\stackrel{\mathrm{alkaline} {\mathrm{KMnO}}_4}{\to }\mathrm{Z}$

Is the compound $\mathrm{Z}$ optically active? Justify your answer.

The major product in the following reaction is :