Among the following metal carbonyls, the C-O bond order is lowest in

Question

Among the following metal carbonyls, the C-O bond order is lowest in (A) [Mn(CO)6]+  (B) [Fe(CO)5]  (C) [Cr(CO)6]  (D) [V(CO)6]-

Tardigrade Admin · Accepted Answer

Greater the extent of dπ -p π back bonding, smaller will be the bond order of CO bond in metal carbonyls. In Fe(CO)5 , there is maximum number of valence shell electrons (d-electrons), greatest chances of p π - d π back bonding, lowest bond order of CO bond.

Q. Among the following metal carbonyls, the $C - O$ bond order is lowest in

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

$[F e (CO)_{5}]$

$[C r (CO)_{6}]$

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

Greater the extent of $d π - p π$ back bonding, smaller will be the bond order of $CO$ bond in metal carbonyls. In $F e (CO)_{5},$ there is maximum number of valence shell electrons ( $d$ -electrons), greatest chances of $p π - d π$ back bonding, lowest bond order of $CO$ bond.

Q. Among the following metal carbonyls, the C−O bond order is lowest in

[Mn(CO)6​]+

[Fe(CO)5​]

[Cr(CO)6​]

[V(CO)6​]−