Question

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

• A. $Fe(CO{)}_5$
• B. $Mn(CO{)}_6^{+}$
• C. $Cr(CO{)}_6$
• D. $V(CO{)}_6^{-}$

Answer 1

Answer: (B)

Due to positive oxidation state of Mn back donation in π* ABMO of CO is minimum therefore C-O bond is strongest.