C≡O bond length is 1.128 Å then C–O bond length in [Fe(CO)5] will be:-  (1) 1.119Å (2) 1.122Å (3) 1.17Å (4) 1.90Å  Anwer is c please explain how​  

Dear Student,

Synergic bond is formed between Fe and C of CO, therefore, the bond order of CO decreases. As a result, the bond length of CO will increase so (1) and (2) cannot be correct. There is too much increase in the bond length in (4) which is not possible, therefore the correct answer is (3).

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