Polydentate ligands can vary in the number of coordination positions they occupy. In each of the following,

Question:

Polydentate ligands can vary in the number of coordination positions they occupy. In each of the following, identify the polydentate ligand present and indicate the probable number of coordination positions it occupies:
(a) [Co(NH3)4 (o-phen)]Cl3
(b) [Cr (C2O4) (H2O)4]Br
(c) [Cr[DATA)(H2O]
(d) [Zn(en)2](ClO4)2