Chemistry - Halogen Derivative Question with Solution | TestHub

${\left({\text{C}}_6{\text{H}}_5\right)}_2\stackrel{\oplus }{\text{C}}{\text{CH}}_3>{\left({\text{C}}_{\text{6}}{\text{H}}_{\text{5}}\right)}_2\stackrel{\oplus }{\text{C}}\text{CH}$

${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}-\stackrel{\oplus }{\text{C}}-{\text{CH}}_3>{\text{C}}_{\text{6}}{\text{H}}_{\text{5}}-\stackrel{\oplus }{\text{C}}{\text{H}}_2$
Reactivity for${\mathrm{S}}_{\mathrm{N}}1$reaction depends on stability of carbocation
Stability of carbocation$\propto$charge delocalization$\propto$hence stability of carbocation is
$4>2>3>1$
Reactivity for${\mathrm{S}}_{\mathrm{N}}1\propto$stability of carbocation
i.e.$\underset{\left(\mathrm{D}\right)}{\left({\mathrm{C}}_6{\mathrm{H}}_5\right)\mathrm{C}\mathrm{C}{\mathrm{H}}_3}>\underset{\left(\mathrm{B}\right)}{({\mathrm{C}}_6{\mathrm{H}}_5{)}_2\mathrm{C}\mathrm{H}}>\underset{\left(\mathrm{C}\right)}{{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\left(\mathrm{C}{\mathrm{H}}_3\right)}>\underset{\left(\mathrm{A}\right)}{{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_2}$