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Question

Which of the following species does not follow EAN rule?

A
[Fe(CN)6]3
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B
[Co(NH3)6]Cl3
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C
Mn2(CO)10
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D
Cr(CO)6
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Solution

The correct option is B [Fe(CN)6]3
Let us consider [Fe(CN)6]3
Fe has +3 oxidation state
The number of electron in Fe(III)of the complex
=263=23
number of electrons donated by the 6 CN is 12
EAN of Fe(III) in [Fe(CN)6]3=23+12=35
Since this number is different from the electrons present in the next Nobel gas (Kr=36), EAN rule is not satisfied.

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