In the isoelectronic series of metal carbonyl | vedclass

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Question

(B) The $CO$ bond strength is inversely proportional to the extent of back-bonding from the metal to the $CO$ ligand. Greater negative charge on the m

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) The $CO$ bond strength is inversely proportional to the extent of back-bonding from the metal to the $CO$ ligand. Greater negative charge on the metal center increases the electron density,which enhances the back-donation into the $\pi^*$ antibonding orbitals of $CO$. This weakens the $C-O$ bond. The order of negative charge is $[V(CO)_6]^- > [Cr(CO)_6] > [Mn(CO)_6]^+$. Therefore,the extent of back-bonding follows the order: $[V(CO)_6]^- > [Cr(CO)_6] > [Mn(CO)_6]^+$. Consequently,the $CO$ bond strength increases in the 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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