Question

Identify the overlapping orbitals involved in hyperconjugation from following.

• A. \(\sigma -p\)
• B. \(\pi -\pi\)
• C. \(\sigma -\sigma\)
• D. \(p-p\)

Hint:

In hyperconjugation a C-H sigma bond overlaps with an adjacent p orbital or pi system.

Answer 1

The Correct Option is A

Step 1: Elimination approach
$\pi-\pi$ overlap is conjugation in alternating double bonds, not hyperconjugation.

Step 2: Why the other options fail
$\sigma-\sigma$ overlap forms a bond, and $p-p$ overlap gives a pi bond. Neither is hyperconjugation.

Step 3: Remaining option
Only $\sigma-p$ matches the C-H bond overlapping with an adjacent p orbital.

Final Answer:
Hyperconjugation is sigma-p overlap. \[ \boxed{\text{(A) }\sigma-p} \]