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Which one of the following represents a correct order of bond lengths?

1. C-C > C=C > C(triple)C > C(triple)N
2. C=N > C=O > C=C
3. C=C > C=N > C=O
4. C-C > C=C > C(triple)C > C-H

Correct answer: C-C > C=C > C(triple)C > C(triple)N

Solution

Within carbon-carbon bonds the order C-C > C=C > C(triple)C holds. A C(triple)N is shorter than C(triple)C because N is smaller than C, so the full chain C-C > C=C > C(triple)C > C(triple)N is correct.

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