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Question

Which one of the following complex species does not obey the EAN rule?

A
[Cu(CN)4]3
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B
[Cr(NH3)6]3+
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C
[Fe(CN)6]4
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D
[Ni(CO)4]
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Solution

The correct option is B [Cr(NH3)6]3+
EAN stands for effective atomic number. It is used to check the stability of organometallic compounds.

For a compound to obey EAN rule, its EAN value should be equal to atomic number of nearest noble gas to the central metal atom.

EAN=ZO.N+2[C.N]
Z Atomic number
O.N Oxidation number
C.N Coordination number
EAN for :
[Cu(CN)4]3
291+2×4=36
[Cr(NH3)6]3+=33
243+2×6=33
[Fe(CN)6]4=36
262+2×6=36
[Ni(CO)4]=36
280+2×4=36

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