Heating of 2-chloro-1-phenylbutane with $\mathrm{E}\mathrm{t}\mathrm{O}\mathrm{K}/\mathrm{E}\mathrm{t}\mathrm{O}\mathrm{H}$ gives $\mathrm{X}$ as the major product. Reaction $\mathrm{X}$ with $\mathrm{H}\mathrm{g}{\left(\mathrm{O}\mathrm{A}\mathrm{c}\right)}_2/{\mathrm{H}}_2\mathrm{O}$ followed by $\mathrm{N}\mathrm{a}\mathrm{B}{\mathrm{H}}_4$ gives $\mathrm{Y}$ as the major product. $\mathrm{Y}$ is:

The major product of the following reaction is:

In the given reaction sequence, the major product '$\mathrm{C}$' is :

${\mathrm{C}}_8{\mathrm{H}}_{10}\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\stackrel{{\mathrm{HNO}}_3}{⟶}}\mathrm{A}\underset{\mathrm{\Delta }}{\stackrel{{\mathrm{Br}}_2}{⟶}}\mathrm{B}\underset{\mathrm{KOH}}{\stackrel{\mathrm{alcoholic}}{⟶}}\mathrm{C}$

Consider the above reaction. The number of $\mathrm{\pi }$ electrons present in the product '$\mathrm{P}$' is: