Question

what is the oxidation number of gly ligand ?

Answer 1

Molecular FormulaC2H4NO2

Average mass74.059 Da

Monoisotopic mass74.024750 Da

Answer 2

The co-ordination number is the number of bonds the central ion makes to the ligands (gly and H2O) surrounding it. 

Glycine is a bidentate ligand = it makes TWO bonds to the central ion. Water is monodentate = it makes ONE bond. 

So the co-ordination number of copper in your complex is 5 

(two gly ligands occupying 2x2 = 4 positions and one H2O ligand occupying 1 position )