Question

Among the following, metal carbonyls, the C—O bond is strongest :

• A. [Mn(CO)6]+
• B. [Cr(CO)6]
• C. [V(CO)6]–
• D. [Ti(CO)6]2–

Answer 1

Answer: (A)

$Mn(CO)6$+

Answer 2

As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into the p* orbitals of CO ligand to weaken the C – O bond.

Hence order of C – O bond strength is :

[Mn(CO)6]+ > [Cr(CO)6] > [V(CO)6]– > [Ti(CO)6]2–.