$[Co_2(CO)_8]$ displays
- Aone $Co-Co$ bond,six terminal $CO$ and two bridging $CO$
- Bone $Co-Co$ bond,four terminal $CO$ and four bridging $CO$
- Cno $Co-Co$ bond,six terminal $CO$ and two bridging $CO$
- Dno $Co-Co$ bond,four terminal $CO$ and four bridging $CO$
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The $\pi$-acid ligand which uses its $d$-orbital during synergic bonding in its complex compound is
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Statement $I$: The $M - C \sigma$ bond is formed by the donation of a lone pair of electrons on the carbonyl carbon into a vacant orbital of the metal.
Statement $II$: The $M - C \pi$ bond is formed by the donation of a pair of electrons from a filled $d$-orbital of the metal into the vacant antibonding $\pi^*$ orbital of carbon monoxide.
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Statement $II$: The $M - C \pi$ bond is formed by the donation of a pair of electrons from a filled $d$-orbital of the metal into the vacant antibonding $\pi^*$ orbital of carbon monoxide.
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