Question

Which of the following complexes do not follow EAN rule?

• A. $ {{[Fe{{(CN)}_{6}}]}^{4-}} $
• B. $ {{[Fe{{(CN)}_{6}}]}^{3-}} $
• C. $ Ni{{(CO)}_{4}} $
• D. $ {{[PdC{{l}_{4}}]}^{2-}} $

Answer 1

Answer: (B)

According to Sedgwick, EAN = atomic number of nearest noble gas Incase of $ {{[Fe{{(CN)}_{6}}]}^{3-}}, $ $ EAN=26-3+2\times 6 $ $ =35 $ While, the atomic number of nearest noble gas is 36. Thus, it does not follow EAN rule.