Q.

Iron carbonyl, Fe(CO)5 is

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a

mononuclear

b

trinuclear

c

tetranuclear 

d

dinuclear.

answer is B.

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Detailed Solution

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Iron carbonyl is a mononuclear in which one Fe atom is surrounded by five CO ligands.
Mononuclear complexes have only one metal atom or ion and are surrounded by ligands.
The iron carbonyl structure shows one carbon atom surrounded by carbonyl ligands; hence, it is a mononuclear species.

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