In the isoelectronic series of metal carbonyl | vedclass

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(B) In metal carbonyls,the $CO$ bond strength is inversely proportional to the extent of $\pi$-back bonding from the metal to the $CO$ ligand. As the

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

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(B) In metal carbonyls,the $CO$ bond strength is inversely proportional to the extent of $\pi$-back bonding from the metal to the $CO$ ligand. As the positive charge on the central metal atom increases,its ability to donate electron density into the $\pi^*$ anti-bonding orbitals of the $CO$ ligand decreases. The oxidation states of the metals are $V$ in $[V(CO)_6]^-$ is $-1$,$Cr$ in $[Cr(CO)_6]$ is $0$,and $Mn$ in $[Mn(CO)_6]^+$ is $+1$. Therefore,the extent of back-bonding decreases in the order $[V(CO)_6]^- > [Cr(CO)_6] > [Mn(CO)_6]^+$. Consequently,the $CO$ bond strength increases in the order $[V(CO)_6]^- < [Cr(CO)_6] < [Mn(CO)_6]^+$.

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

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