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(A) In metal carbonyls,the strength of the $CO$ bond is inversely proportional to the extent of back-bonding from the metal to the $CO$ ligand. Back-b

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$[Cr(CO)_6]^+$

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(A) In metal carbonyls,the strength of the $CO$ bond is inversely proportional to the extent of back-bonding from the metal to the $CO$ ligand. Back-bonding increases as the electron density on the metal increases,which in turn weakens the $CO$ bond. Comparing the given complexes: $1$. $[V(CO)_6]^-$: The metal center has a negative charge,increasing electron density,leading to maximum back-bonding and the weakest $CO$ bond. $2$. $[Fe(CO)_5]$: Neutral complex. $3$. $[Cr(CO)_6]^+$: The metal center has a positive charge,which decreases electron density on the metal,thereby reducing back-bonding. Since back-bonding is minimal in $[Cr(CO)_6]^+$,the $CO$ bond remains strongest in this complex.

The strongest $CO$ bond is present in

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