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In some cases Co can act as a bridging ligand between main-group and transition-metal atoms. When it forms a bridge between Al and W in the compound having the formula (C6H5)3 Al- [bridging Co-W(CO)2(C5H5), is the order of toms in the bridge Al-co-W or Al-oc-W? Briefly explain your choice.
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Answer #1

Al - OC-W would be the right answer.
W forms sigma and pi back bonding with the CO , Al forms sigma bond with O of CO because it is more electronegative. This information can be derived from the molecular orbital diagrams .

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