1. Symmetry arguments suggest that most ligands engage metals via multiple bonds . 2. This effect is shown by those compounds containing multiple bonds . 3. Multiple pairs represent multiple bonds , such as double bonds and triple bonds. 4. Cycloalkanes do not contain multiple bonds , whereas the cycloalkenes and the cycloalkynes do. 5. For multiple bonds and lone pairs, different localization procedures ? and ? symmetry. 6. Metals, too, can engage in multiple bonding in a metal ligand multiple bond . 7. Also, the energy estimate can be only used for single, not for multiple bonds . 8. This was added for clarity-multiple bonds are not normally coloured in skeletal formulae ." 9. Note that when used to refer to moieties, multiple single bonds differ from a single multiple bond . 10. Except for aromatic compounds, unsaturated hydrocarbons are highly reactive and undergo addition reactions to their multiple bonds .
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