Iron carbonyl, Fe(CO)5 is
Tetranuclear
Mononuclear
Dinuclear
Trinuclear
B.
Mononuclear
Fe(CO)5
EAN = Z - O.N + 2 (C.N)
Here, Z = Atomic number
O.N = Oxidation number
C.N = Coordination number
= 26 - 0 + 2(5)
= 26 + 10
= 36
Only one central atom is present and it follows EAN rule, so it is mononuclear.
