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  • Which of the following has the longest C-O bond length? (Free C-O bond length in CO is )<div class='q

Which of the following has the longest C-O bond length? (Free C-O bond length in CO is 1.128\AA)

Option: 1

Ni(CO)_{4}


Option: 2

\left [ Co(CO)_{4} \right ]^{-}


Option: 3

\left [ Fe(CO)_{4} \right ]^{2-}


Option: 4

\left [ Mn (CO)_{6} \right ]^{+}


Answers (1)

best_answer

Carbon monoxide is a strong field ligand as it accepts an electron density from metal into the \pi^* orbitals. Due to this back bonding bond length of the Carbon oxygen bond increases. 

Bond\ length\ \alpha\ negative\ charge

Bond\ length\ \alpha\ \frac{1}{positive\ charge}

and, 

Bond\ length\ \alpha\ number\ of\ d-electrons

[Fe(CO)_4]^2^- has the maximum length of the carbon-oxygen bond as the metal is carrying the highest negative charge and will show the most synergic or back bonding leading to an increase in Carbon-oxygen bond length and will be mximum. 

The Correct answer is option 3.

 

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