In $F e_{2} (C O)_{9}$ , the EAN of Fe is

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Solution

The correct option is B 36
In this structure, each iron atom is surrounded by 3 terminal $C O$ bonds, 3 bridged $C O$ bonds and 1 Fe-Fe bond.
Terminal $C O$ donates 2 electrons each to the central metal atom and bridged ligands donates 1 electron to each metal atom. The metal-metal bond share 1 electron each.
$∴$ EAN = 26 + 6 + 3 + 1 = 36

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