In the isoelectronic series of metal carbonyl | vedclass

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Question

(B) The $CO$ bond strength in metal carbonyls is inversely proportional to the extent of $M \rightarrow CO$ $\pi$-back bonding.Greater negative charge

Vedclass · Accepted Answer

$[V(CO)_6]^- < [Cr(CO)_6] < [Mn(CO)_6]^+$

Vedclass · Answer

(B) The $CO$ bond strength in metal carbonyls is inversely proportional to the extent of $M \rightarrow CO$ $\pi$-back bonding.Greater negative charge on the metal center increases the electron density on the metal,which enhances the $\pi$-back donation to the $CO$ antibonding $\pi^*$ orbitals,thereby weakening the $CO$ bond.For the isoelectronic series: $[V(CO)_6]^-$ (charge $-1$),$[Cr(CO)_6]$ (charge $0$),and $[Mn(CO)_6]^+$ (charge $+1$).The extent of back donation follows the order: $[V(CO)_6]^- > [Cr(CO)_6] > [Mn(CO)_6]^+$.Therefore,the $CO$ bond strength follows the reverse order: $[V(CO)_6]^- Thus,the correct option is $B$.

In the isoelectronic series of metal carbonyls,the $CO$ bond strength is expected to increase in the order:

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