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Iron carbonyl, Fe(CO)5 is...

Iron carbonyl, `Fe(CO)_5` is

A

trinuclear

B

mononuclear

C

tetranuclear

D

dinuclear

Text Solution

Verified by Experts

The correct Answer is:
B
Key Concept Compounds of transition metal with carbonyls (carbon monoxide) are know as metal carbonyls. These are classified into mononculear, dinuclear, trinuclear and so on based on the number of central metal atoms/ions present in a complex.
Complexes following EAN rule have EAN of central metal/ion equal to nearest inert gas configuration and hence, are stable.
Effective atomic number (EAN) of the metal in a complex is given by
EAN=Atomic number (Z)-Oxidation number (O.N)+2(Coordination number)
=26-0+2(5)=36
Thus, `Fe(CO)_(5)` is a stable complex/ion. Since, there is only one central metal atom present in iron carbonyl, `Fe(CO)_(5)`, thus it is monouclear. The structure of `Fe(CO)_(5)` is shown below :

The examples of dinulear, trinuclear complexes are `CO_(2)(CO)_(18), Fe_(3)(CO)_(12)` respectively.
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In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which one of the following metal carbonyls are inner orbital complexes with diamagnetic property ? (P) Ni(CO)_(4)" "(Q) Fe(CO)_(5) (R ) V(CO)_(6)" "(S) Cr(CO)_(6) Select the correct answer from the codes given below :