Question

What is called no bond Resonance?

Answer 1

1. Resonance is defined as the representation of a compound by more than one Lewis structure and the actual structure is the hybrid of all the possible structures.
2. Hyperconjugation is defined as a resonance involving the delocalization of pi electrons leaving the sigma bond untouched.
3. However, Hyperconjugation is also called no bond Resonance because it involves the delocalization of sigma electrons into the nearby pi orbitals or empty, full, or partially filled orbitals.
4. As a result of this, no bond exists between Carbon and Hydrogen.
5. It is a permanent effect.
6. Example of Hyperconjugation- In Ethyl cation, the electrons between $\mathrm{C}-\mathrm{H}$ ( ${\mathrm{sp}}^3$ ) Carbon will shift towards the empty p orbital of Carbon (${\mathrm{sp}}^2$ ) and thus delocalization of electrons occurs.