Chemistry - GOC Question with Solution | TestHub

The $\mathrm{s}{\mathrm{p}}^3$ carbon of $\mathrm{C}{\mathrm{H}}_3$ is less electronegative than the $\mathrm{s}{\mathrm{p}}^2$ ring carbon, so $\mathrm{C}{\mathrm{H}}_3$ pushes electrons into the ring: +I.