Chemistry - GOC Question with Solution | TestHub

All are $3^{\circ }$ carbocation, $\mathrm{III}$ is having 6 $\alpha \mathrm{H}$, $\mathrm{II}$ is having 4$\alpha \mathrm{H}$ and $\mathrm{I}$ is having only 1-$\alpha \mathrm{H}$ and IV is least stable because of angle strain at bridge head.