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Hyperconjugation involves the electrons from an adjacent bond to "donate" electrons to an empty p orbital. Now if we consider a filled p orbital, or a carbo-anion, then there will be a repulsive force according to Coulomb's law. This will destabilize the molecule in question. However, resonance involves the delocalization of electrons in a molecule; whether ...


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In carbanion the carbon carrying negative charge contains one $\mathrm{sp^3}$ hybrid orbital which contains a pair of electrons and therefore there is no possibility that it will undergo bonding interaction with the neighbouring $\ce{C-H}$ bond, due to repulsion between the electrons.


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