The correct option is
C (I) NF (II) NF (III) F (IV) F
EAN=Z−X+YZ
=Atomic number of the metal
X
=Number of electrons lost during the formation of the metal ion from its atom
Y
=Number of electrons donated by the ligands
(i) For [Ph3P)2PdCl2] AN of Pd=46−2+4×2=52.
The atomic number of xnon is 54.
Hence, it does not follows EAN.
(ii) For [NiBrCl(en)], EAN of Ni=28−2+8=34.
The atomic number of krypton is 36.
Hence, it does not follows EAN.
(iii) For Na4[Fe(CN)5NOS], EAN of Fe=26−2+5×2+2=36.
This is equal to the atomic number of krypton.
Hence, it follows EAN.
(iv) For Cr(CO)3(NO)2, EAN of Cr=24−0+3×2+3×2=36[Kr].
This is equal to the atomic number of krypton.
Hence, it follows EAN.