Question 65. In which one of the following metal carbonyls, CO forms a bridge between metal atoms?
(1) [CO2(CO)8 ]
(2) [Mn2(CO)10]
(3) [OS3(CO)12]
(4) [Ru3(CO)12]
Answer: (1)
Explanation:
In metal carbonyls, carbon monoxide can act as a terminal ligand or as a bridging ligand between two metal atoms.
In [CO2(CO)8] two CO ligands act as bridging carbonyls between the two cobalt atoms.
Hence, CO forms a bridge between metal atoms in this compound.
In [Mn2(CO)10] all CO ligands are terminal.
In [OS3(CO)12]and [Ru3(CO)12]
CO ligands are also terminal and do not form bridges.
Therefore, the correct answer is option (1).