MHT CET 2022 Chemistry question
The bond enthalpies of C-C, C=C, H-H and C-H bonds are 350, 600, 400 and 410 kJ respectively. What is the the heat of hydrogenation of ethylene?
Answer: (C)
Solution
The reaction is \mathrm{CH_2{=}CH_2 + H{-}H \rightarrow CH_3{-}CH_3}. Bonds broken: one (600) and one (400), total . Bonds formed: one (350) and two (), total .
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