A) \[{{[Fe{{(CN)}_{6}}]}^{4-}}\]
B) \[{{[Ag{{(CN)}_{2}}]}^{-}}\]
C) \[{{[PtC{{l}_{6}}]}^{2-}}\]
D) None of these
Correct Answer: B
Solution :
[b] Key Idea: EAN = Atomic number of central atom + number of \[{{e}^{-}}\]gained via ligands \[-\]oxidation state of central atom According to EAN for stable complex value RAN = Atomic number of noble gas. [a]\[{{[Fe{{(CN)}_{6}}]}^{4-}}\] \[\text{EAN}=26+2\times 6-2\] \[=36\] 36 is atomic number of Ar (noble gas). So this complex follows EAN rule. [b]\[{{[Ag{{(CN)}_{2}}]}^{-}}\] \[\text{EAN}=47+2\times 2-1\] \[=50\] \[\ \because \]50 is not atomic number of any noble gas. \[\therefore \]it does not follow EAN rule. [c]\[{{[PtC{{l}_{6}}]}^{2-}}\] \[\text{EAN}=78+2\times 6-4\] \[=86\] 86 is atomic number of noble gas Rn. So it follows EAN rule.
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