ΔHf(C₂H₄) = 12.5 kcal Heat of atomisation of C = 171 kcal Bond energy of H₂ = 104.3 kcal Bond energy C−H = 99.3 kcal What is C=C bond energy?
- A140.9 kcal
- B49 kcal
- C40 kcal
- D76 kcal
✓ Correct answer: A
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