Which of the following does not obey EAN (Effective Atomic Number) rule?

F e (C O)_{5}

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K_{4} [F e (C N)_{6}]

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[C u (N H_{3})_{4}] S O_{4}

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[C o (N H_{3})_{6}] C l_{3}

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Solution

The correct option is C $[C u (N H_{3})_{4}] S O_{4}$
EAN $=$ (atomic number - ion charge) + (number of ligands $\times$ number of electrons per ligands)

EAN values of the given complexes are:
$= 26 - 0 + 10 = 36$
$= 26 - 2 + 12 = 36$
$= 29 - 2 + 8 = 35$ (does not obey EAN rule)
$= 27 - 3 + 12 = 36$

Option C is correct.

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F e (C O)_{5}

N i (C O)_{4}

K_{4} [F e (C N)_{6}]

N a_{3} [C u (S C N)_{4}]

E A N

18

[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

[C r (N H_{3})_{6}]^{3 +}, [C r (C O)_{6}]

[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

F e (C O)_{s}

N i (C O)_{4}

K_{4} [F e (C N)_{6}]

N a_{3} [C u (S C N)_{4}]

E A N

Which does not obey EAN rule?

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