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Which of the following carbonyls will have the strongest C - O bond?

Option: 1

\text{V}\left ( \text{CO} \right )^{-}_{6}


Option: 2

Fe(CO)5


Option: 3

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


Option: 4

\text{Cr}\left ( \text{CO} \right )_{6}


Answers (1)

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CO is a pi acceptor ligand, it accepts electron cloud density from metal centre resulting in synergistic effect which called M→L charge transfer. Stronger the M→CO bond weaker the CO bond strength.

Since the manganese complex has a positive metal centre, it is reluctant to give away the electron. As a result, the M→CO bond in the mangnese complex is the weakest.

Hence Mn (CO)_{6}^{+}complex has the strongest C=O bond.

Posted by

Nehul

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