Chemistry - GOC Question with Solution | TestHub

Reactivity of${\mathrm{E}}^{+}$substitution$\propto$$\mathrm{\pi }{\mathrm{e}}^{-}$can be present on the aromatic compound.
Electrophilic substitution$\propto +\mathrm{M}\mathrm{ }\propto \frac{1}{-\mathrm{M}}$
$\propto +\mathrm{H}\mathrm{C}\mathrm{ }\propto \frac{1}{-\mathrm{H}\mathrm{C}}$
$\propto +\mathrm{I}\mathrm{ }\propto \frac{1}{-\mathrm{I}}$

(order of${\mathrm{e}}^{-}$density$\mathrm{\alpha }$electrophilic substitution)
Ring${\mathrm{e}}^{-}$density is highest.
So$\mathrm{B}>\mathrm{C}>\mathrm{A}>\mathrm{D}$