Ligands are broadly classified into two classes classical and non-classical ligands, depending on their donor annd acceptor ability. Classical ligands form classical complexes while non-classical ligands form non-classical complex. Bonding mechanism in non-classical is called synergic bonding.
Q. In compound `[M(CO)_(n)]^(x)`, the correct match for highest 'M-C' bond length for given M, n and z respectively:

Options

A. M-Cr, n-6, z-0
B. M-V, n-6, z- `-1`
C. M-Ti, n-6, z- `-2`
D. M-Mn, n-6, z- `+1`

Answer

D

Explanation

Higher the positive oxidation state of metal, poor will be `M overset(pi) to l`. Hence `overset(+1)(Mn) -C` bond will longer among given complexes.