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Select the complex whith maximum C-O bond lenth 1.[Mn(CO)6] 2.Ni(CO)4 3.[Co(CO)4]- 4.[Fe(CO)4]2-?
Most Upvoted Answer
Select the complex whith maximum C-O bond lenth 1.[Mn(CO)6] 2.Ni(CO)4...
As CO is a neutral ligand so charge on complex indicate charge on CMI more the charge on CMI more it can donate its e- in antibonding orbitals of CO to form pi - back bond ( i.e Synergic bond ) and bond order of CO decrease and bond length of CO increase. SO OPTION 4 IS CORRECT.
Community Answer
Select the complex whith maximum C-O bond lenth 1.[Mn(CO)6] 2.Ni(CO)4...
As the negative charge on metal carbonyl complex increases back pie bonding increases and hence the bond length of C-O bond increases while the bond length of metal carbon bond decreases.
Hence, [Fe(CO)4]-2 has longest C-O bond length among the given complexes...

So, correct answer is option (4)...

$$Hope it's help... $$
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Select the complex whith maximum C-O bond lenth 1.[Mn(CO)6] 2.Ni(CO)4 3.[Co(CO)4]- 4.[Fe(CO)4]2-?
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