Question
Inorganic Chemistry Question on Chemical bonding and molecular structure
The order of increasing CO stretching frequencies in [Co(CO)4]−,[Cu(CO)4]+,[Fe(CO)4]2−and[Ni(CO4)] is
A
[Cu(CO)4]+<[Ni(CO)4]<[Co(CO)4]−<[Fe(CO)4]2−
B
[Fe(CO)4]2−<[Co(CO)4]−<[Ni(CO)4]<[Cu(CO)4]+
C
[Co(CO)4]−<[Fe(CO)4]2−<[Cu(CO)4]+<[Ni(CO)4]
D
[Ni(CO)4]<[Cu(CO)4]+<[Co(CO)4]−<[Fe(CO)4]2−
Answer
[Fe(CO)4]2−<[Co(CO)4]−<[Ni(CO)4]<[Cu(CO)4]+
Explanation
Solution
The correct option is (B): [Fe(CO)4]2−<[Co(CO)4]−<[Ni(CO)4]<[Cu(CO)4]+