Chemistry - Halogen Derivative Question with Solution | TestHub

Hereis least reactive towards${\mathrm{S}}_{\mathrm{N}}1$.
Rate of${\mathrm{S}}_{\mathrm{N}}1\propto$stability of carbocation

$\left(\mathrm{A}\right)\Rightarrow$Anti aromatic
$\left(\mathrm{B}\right)\Rightarrow$Non-aromatic (no resonance)
$\left(\mathrm{C}\right)\Rightarrow$Non-aromatic (resonance)
$\left(\mathrm{D}\right)\Rightarrow$Aromatic
Stability order
Aromatic > non-aromatic > anti-aromatic
So D > C > B > A.