$(I)\, [(Ph_3P)_2PdCl_2PdCl_2]$ $(II)\,[NiBrCl(en)]$
$(III)\, Na_4 [Fe(CN)_5 NOS]$ $(IV)\, Cr(CO)_3(NO)_2$
$(I)\,-\,(II)\,-\,,(III)\,-\,(IV)$
\((II)\, [NiBrCl(en)]\) ; \(EAN\) of \(Ni = 28 - 2 + 8 = 34\)
\((III)\, Na_4[Fe(CN)_5NOS]\) ; \(EAN\) of \(Fe = 26 - 2 + 5 \times 2 + 2 = 36 [Kr]\)
\((IV)\, Cr(CO)_3(NO)_2\) ; \(EAN\) of \(Cr = 24 - 0 + 3 \times 2 + 3 \times 2 = 36[Kr]\)