Question
Iron carbonyl, $\ce{Fe(CO)_{5​}}$ is $.........$

Answer

Iron carbonyl, $\ce{Fe(CO)_5}$​ is mononuclear. In $\ce{Fe(CO)_5}​,$ one $Fe$ atom is surrounded by $5 \ CO$ ligands.
Mononuclear complexes are those complexes in which one metal atom/ion is surrounded by ligands.

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