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

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-

Tardigrade Admin · Accepted Answer

The presence of a positive charge on the metal carbonyl would resist the flow of the metal electron to π star orbitals of CO . THis would increase the CO bond order and hence CO in a metal carbonyl will absorb at a higher frequency compared to its absorption in a neutral metal carbonyl.

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

$F e (CO)_{5}$

$M n (CO)_{6}^{+}$

$C r (CO)_{6}$

$V (CO)_{6}^{-}$

The presence of a positive charge on the metal carbonyl would resist the flow of the metal electron to $π^{⋆}$ orbitals of $CO$ . THis would increase the $CO$ bond order and hence $CO$ in a metal carbonyl will absorb at a higher frequency compared to its absorption in a neutral metal carbonyl.

Q. Which of the following carbonyls will have the strongest C−O bond?

Fe(CO)5​

Mn(CO)6+​

Cr(CO)6​

V(CO)6−​

The presence of a positive charge on the metal carbonyl would resist the flow of the metal electron to π⋆ orbitals of CO . THis would increase the CO bond order and hence CO in a metal carbonyl will absorb at a higher frequency compared to its absorption in a neutral metal carbonyl.

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

$F e (CO)_{5}$

$M n (CO)_{6}^{+}$

$C r (CO)_{6}$

$V (CO)_{6}^{-}$

The presence of a positive charge on the metal carbonyl would resist the flow of the metal electron to $π^{⋆}$ orbitals of $CO$ . THis would increase the $CO$ bond order and hence $CO$ in a metal carbonyl will absorb at a higher frequency compared to its absorption in a neutral metal carbonyl.