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:
