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`Fe_(2)(CO)_(9)` is diamagnetic. Which of the following reasons is correct?

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`Fe_(2)(CO)_(9)` is diamagnetic. Which of the following reasons is correct?
A. Presence of one CO as bridge group
B. Presence of monodentate ligand
C. Metal -metal (Fe-Fe) bond in molecule
D. Resonance hybridization of CO.
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Correct Answer - C
Metal -Metal `(Fe-Fe)` bond pair up the unpaired electron.
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