Iron carbonyl, Fe(CO)5 is
trinuclear
mononuclear
tetranuclear
dinuclear
As we learnt that
Mononuclear Coordination entity -
Contain a single central metal atom
- wherein
Only single metal
In Fe(CO)5 has only one metal atom so it is mononuclear complex.
Option 1)
trinuclear
This is incorrect.
Option 2)
mononuclear
This is correct.
Option 3)
tetranuclear
This is incorrect.
Option 4)
dinuclear
This is incorrect.