Increasing rate of ${\mathrm{S}}_{\mathrm{N}}1$ reaction in the following compounds is:
(I)
(II)
(III)
(IV)

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:

The major product in the reaction

In the given reaction

'$\mathrm{A}$' can be

The major product of the following reaction is