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Which compound has the longest carbon-carbon bond length?.

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Hokkaido University researchers have synthesized an organic compound with a longer bond between carbon atoms than ever before - exceeding the assumed limit for carbon-carbon single bond (C-C) lengths. The researchers termed it a "hyper covalent bond." The novel polycyclic hydrocarbon named 10c is stable, and an X-ray analysis showed that its C-C bond lengths was as long as 1.806 angstroms, longer than the previously reported world records for hydrocarbons.

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