A) As \[M-C\pi \] bonding increases, the C-O bond length increases.
B) As positive charge on the central metal atom increase the C-O bond length increases.
C) As electron density on the central metal atom increase the C-O bond length increases.
D) [a] and [c] both.
Correct Answer: D
Solution :
[d] Order of C-O bond strength: \[{{[Mn{{(CO)}_{6}}]}^{+}}>[Cr{{(CO)}_{6}}]>{{[V{{(CO)}_{6}}]}^{-}}>{{[Ti{{(CO)}_{6}}]}^{2-}}\]and \[[Ni{{(CO)}_{4}}]>{{[Co{{(CO)}_{4}}]}^{-}}>{{[Fe{{(CO)}_{4}}]}^{2-}}\] True statement. As +ve charge on the central metal atom increases, the less readily the metal can donate electron density into the \[{{\pi }^{*}}\] orbitals of CO ligand to weaken the C-O bond. In the carbonylate anions, the metal has a greater electron density to be dispersed, with the result that M-C\[\pi \]bonding is enhanced and the C-O bond is diminished in strength.
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