A) \[{{[Fe{{(CN)}_{6}}]}^{4-}}\]
B) \[{{[Ag{{(CN)}_{2}}]}^{-}}\]
C) \[{{[PtC{{l}_{6}}]}^{2-}}\]
D) None of these
Correct Answer: B
Solution :
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 \[EAN=\] Atomic number of noble gas. \[{{[Fe{{(CN)}_{6}}]}^{4-}}\] \[EAN=26+2\times 6-2\] \[=36\] \[36\] is atomic number of \[Ar\] (noble gas). So this complex follows \[EAN\] rule. \[{{[Ag{{(CN)}_{2}}]}^{-}}\] \[EAN=47+2\times 2-1\] \[=50\] \[\because \,\,50\]is not atomic number of any noble gas. \[\therefore \]it does not follow EAN rule. \[{{[PtC{{l}_{6}}]}^{2-}}\] \[EAN=78+2\times 6-4\] \[=86\] \[86\]is atomic number of noble gas \[Rn\]. So it follows EAN rule.
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