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${Fe}_{2} (CO)_{9}$ has 3 bridging $μ_{2} - CO$ groups and 3 terminal CO groups

Each Fe center in ${Fe}_{2} (CO)_{9}$ is $d^{2} s p^{3}$ hybridised

${Fe}_{2} (CO)_{9}$ is diamagnetic with 4 unpaired $e^{-}$ per Fe center.

$δ -$ bond is present in Fe-Fe bond of ${Fe}_{2} (CO)_{9}$

answer is A.

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Detailed Solution

Here, all the statements are correct.

In the molecule ${Fe}_{2} (CO)_{9}$ , the bridging $μ_{2} - CO$ groups are also the terminal CO groups are 3.

In molecule ${Fe}_{2} (CO)_{9}$ each iron atom center which results in $d^{2} s p^{3}$ hybridised.

the nature of ${Fe}_{2} (CO)_{9}$ is diamagnetic as it has 4 unpaired $e^{-}$ per iron center. Also, in this molecule $δ -$ bond is present in iron-iron bonds.

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