Which of the following species does not obey EAN rule?

[Cu(CN)4]3- [Cr(NH3)6]3+ [Fe(CN)6]4- [Ni(CO)4]

[Cr(NH3)6]3+

In [Cr(NH3)6]3+ x + 6(0) = +3 x = 3 Cr3+: [Ar]3d3 EAN = Z - (O.N.) + 2(C.N.) = 24 - (3) + 2(6) = 21 + 12 = 33