In which of the following compounds does the central atom obey EAN rule?

K_{3} F e {(C N)}_{6}

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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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All of the above

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Solution

The correct option is B $K_{4} F e {(C N)}_{6}$
$E A N = e l e c t r o n o n m e t a l i o n + e l e c t r o n d o n a t e d b y l i g a n d s$

Now, let's calculate the $E A N$ value of the given complexes:

$(A) K_{3} F e (C N)_{6} = (26 - 3) + 6 (2) = 35$

It does not follow the $E A N$ rule.

$(B) K_{4} F e (C N)_{6} = (26 - 2) + 6 (2) = 36$

It follows $E A N$ rule.

$(C) C u (N H_{3})_{4} S O_{4} = (29 - 2) + 4 (2) = 35$

It does not follow the $E A N$ rule.

Option B is correct.

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