$π -$ bonding is not involved in :

ferrocene

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dibenzene chromium

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zeise's salt

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grignard reagent

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Solution

The correct option is D grignard reagent
The π-bond in metal carbonyls is formed by overlapping filled dπ orbitals or hybrid dpπ orbitals of a metal atom with low-lying empty (LUMO) orbitals of CO molecule. i.e., $M \to C π$ bonding.
Grignard reagent is $R - M g X$ have sigma bonds only.
Others have pi bonds.

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