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

1. [Mn(CO)6]+
2. [Cr(CO)6]
3. [V(CO)6]−
4. [Fe(CO)5]

Correct answer: [Mn(CO)6]+

Solution

The strongest C–O bond will be in [Mn(CO)6]+ because the positive charge on the metal center increases the back-donation of electron density from the metal to the CO ligands, strengthening the C–O bond.

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