Chemistry - GOC Question with Solution | TestHub

In the homoallyl cation a π bond interacts with the empty orbital of the cation through a $\mathrm{C}{\mathrm{H}}_2$ spacer and a σ bond, forming the cyclopropylcarbinyl structure. A π system and a σ bond are linked through one saturated carbon : this is homoconjugation (π-σ).

Hyperconjugation needs an α C-H or C-C bond directly attached to the π or p system, which is not the case here.