Number of σ and π bonds in C₂H₄ (ethene):
A1 σ + 1 π
B2 σ + 2 π
C4 σ + 1 π
D5 σ + 1 π
Answer & 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.
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