Discussion
Which of the following bond has highest mean bond enthalpy?
Answer: E
The highest mean bond enthalpy is that of C≡O.
The bond in carbon monoxide is the strongest known chemical bond between two atoms, about 1072 kJ mol-1. N≡N is about 946 kJ mol-1, C≡C about 839, O=O about 498 and N=N about 418.
N≡N is the usual trap because nitrogen is so unreactive, but C≡O, with the same number of electrons and some extra ionic character, is stronger still.
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