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Q.
The kind of delocalization involving sigma bond orbital is called
Organic Chemistry – Some Basic Principles and Techniques
Solution:
The kind of delocalization involving sigma bond orbitals is called hyperconjugation. Hyperconjugation is also known as $\sigma-\pi$ conjugation. It is observed in alkyl groups with at least one hydrogen atom on the alpha carbon atom attached to an unsaturated carbon atom.
