The bond resonance is not dependent upon the number of α−H Consider the structure of But-1-ene. CH3−CH2−CH=CH2 But-1-ene possesses 2α−H. So, it gives two no bond resonating structures. Consider thestructure of 3∘ carbocation.
The 3∘ carbocation contains 7α−H bond. Therefore, it forms 7 no bond resonating structures.