Question

The delocalization of electrons due to overlap between p-orbital and sigma bond is called.

• A. Inductive effect
• B. electronic effect
• C. hyperconjugation
• D. resonance

Hint:

Overlap of a sigma bond, usually C-H, with an adjacent p orbital delocalises electrons and is called hyperconjugation.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
When a C-H sigma bond next to a carbocation, free radical or double bond overlaps with the adjacent p orbital, its electrons spread over both.

Step 2: Name of the effect
This \(\sigma\)-p delocalisation is called hyperconjugation, also called no-bond resonance.

Step 3: Compare the options
The inductive effect works through sigma bonds only, and resonance involves pi electrons or lone pairs with p orbitals.

Final Answer:
The effect is hyperconjugation. \[ \boxed{\text{(C) }\text{hyperconjugation}} \]