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  • Which of the following has the longest C-O bond length? Free C-O bond length in CO is <img alt="1.128\,\text{{\AA}}" src="https://learn.careers360.com

Which of the following has the longest C-O bond length? Free C-O bond length in CO is 1.128\,\text{{\AA}}.

Option: 1

Ni(CO)4


Option: 2

[Co(CO)_4]^-


Option: 3

[Fe(CO)4]2-


Option: 4

[Mn(CO)6]+


Answers (1)

best_answer

The higher the oxidation state of the central metal atom, the shorter will be the bond length of the C−O bond as the bond will be strong.

The greater the negative charge on the carbonyl complex, the easier it would be for the metal to permit its electrons to participate in the back bonding, the higher would be the M-C bond order, and simultaneously there would be a larger reduction in the C-O bond order. Thus, [Fe(CO)4]2- has the lowest C-O bond order means the longest bond length.

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Riya

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