Question

34. AH, 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?
(1) 140.9 kcal (2) 49 kcal
(3) 40 kcal
(4) 76 kcal
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Answer 1

Answer:

ans is 40 kcal because of atomisation