I-B; II-D; III-C; IV-A;
I-B; II-D; III-A; IV-C;
I-B; II-A; III-D; IV-C;
I-D; II-B; III-A; IV-C;
(I)….C2O4-2….bidentate
(II)….H2N -CH2-CH2-N H-CH2-CH2-N H-CH2-CH2-N H2….tetradentate;
(III)…. C5H5N….monodentate;
(II)….H2N -CH2-CH2-N H-CH2-CH2-N H2….tridentate;