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The kind of delocalization involving sigma bond orbitals is called _.

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a
Mesomeric effect
 
b
Tautomeric effect
 
c
Electromeric effect
 
d
Hyperconjugative effect

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detailed solution

Correct option is D

Given data : It is given to identify the kind of delocalization involving sigma bond orbitals is called _.

Explanation :

Hyperconjugation is the only phenomenon that includes the delocalization of the sigma bond electron pair. It happens when an alkyl group having at least one H atom and is attached to the vicinity of an unsaturated system.

Hence, the correct option (D).Hyperconjugative effect

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