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Q.
Iron carbonyl, $Fe\left(CO\right)_{5}$ is
Coordination Compounds
Solution:
Based on the number of metal atoms present in a complex, they are classified into mononuclear, dinuclear, trinuclear and so on.
e.g., $Fe\left(CO\right)_{5}$: monondear
$Co_{2}\left(CO\right)_{8}$: dinuclear
$Fe_{3}\left(CO\right)_{12}$: trinuclear