Chemistry - Nomenclature Question with Solution | TestHub

Here only carbocation given in option C do not undergo rearrangement as it is more stable carbocation. In rest other carbocations rearrangement is possible as follows
$\mathrm{A}.$
$\mathrm{B}.$
$\mathrm{D}.$${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{C}{\mathrm{H}}_2-\stackrel{\oplus }{\mathrm{C}}{\mathrm{H}}_2\stackrel{\mathrm{1,2}-\stackrel{\oplus }{\mathrm{H}}\mathrm{s}\mathrm{h}\mathrm{i}\mathrm{f}\mathrm{t}}{\to }{\mathrm{C}}_6{\mathrm{H}}_5-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-\mathrm{C}{\mathrm{H}}_3$