Number of σ and π bonds in C₂H₄ (ethene):
- 1 σ + 1 π
- 2 σ + 2 π
- 4 σ + 1 π
- 5 σ + 1 π
Show answer and solution
Correct answer: D. 5 σ + 1 π
C₂H₄ has C=C (1 σ + 1 π) plus 4 C-H bonds (4 σ).
**Total:** 5 σ bonds + 1 π bond.
The π bond restricts rotation around C=C.