In my book, it's written that the phenyl cation can't be stabilized by resonance. I can't think of any reason why this is so. All the conditions for resonance are satisfied : all carbon atoms lie in one plane, all possible canonical structures will have the same number of unpaired electrons, we'll only move the pi - electrons. Also, I think that the carbon atom having positive charge must be sp - hybridized, as per the orbital diagram, but I guess even that is incorrect. Can anyone explain this???