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Bonding in Metal Carbonyls

Which does no...

Question

Which does not obey EAN rule?

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

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

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

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[N i (C O)_{4}]

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Solution

The correct option is B $K_{3} [F e (C N)_{6}]$
EAN= [Z metal – (ox. state of the metal) + 2(coordination number of the metal)].

EAN value of complexes

$= 26 - 2 + 12 = 36$
$= 26 - 3 + 12 = 35$ does not obey
$= 27 - 3 + 12 = 36$
$= 28 - 0 + 8 = 36$

Option B is correct.

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