I-A ; II-D ; III-C ; IV- B ;
I-B ; II-C ; III-D; IV- A ;
I-B ; II-D ; III-C ; IV- A ;
I-A ; II-C ; III-D ; IV- B ;
Ni+23d8...weak field ligandCl-.... no pairing occurs...sp3; Fe+23d6...weak field ligandH2O.... no pairing occurs...sp3d2; Co+33d6...strong field ligandCN-.... pairing occurs...d2sp3; Pt+2..C.No-4.....irrespective of ligand strength... pairing occurs...dsp2;