The structure of Wheland intermediate obtained after the attack of ${\mathrm{Br}}^{+}$ on anilinium ion is:

 major product is :

Consider the following sequence of reactions.

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{C}\equiv \mathrm{CH}\stackrel{{\mathrm{CH}}_3\mathrm{MgBr}}{⟶}\mathrm{A}\underset{2.{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{1.\mathrm{HCHO}}{\to }}\mathrm{B}$

The product $\left(\mathrm{B}\right)$ is

In the transformations

$\mathrm{PhCH}={\mathrm{CH}}_2\underset{{\mathrm{CH}}_2{\mathrm{Cl}}_2}{\overset{{\mathrm{ArCO}}_3\mathrm{H}}{\to }}\mathrm{A}\underset{2·{\mathrm{H}}_2\mathrm{O}}{\overset{1.{\mathrm{LiAH}}_4{\mathrm{Et}}_2\mathrm{O}}{\to }}\mathrm{B}$

the end product $\left(\mathrm{B}\right)$ is

In the following sequence of reactions, the final product $\mathrm{D}$ is: