MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsWerner’s Theory

Which of the following ion does not follow EAN rule?

A.[Fe(CN)6]4–

B.[Ag(CN)2]–✓ Correct

C.[Pt(Cl)6]2–

D.None of these

Explanation

Here, according to EAN rule, the value of EAN should be equal to the atomic number of the closest noble gas. Value of EAN is given by, EAN =[Z-(O.S)+2(C.N)] So, 4- 6 - 2 2- 6 (a) Fe(CN) EAN=26-2+2(6)=36 (b) Ag(CN) EAN=47-1+2(2)=50 (c) Pt(Cl) EAN=78-4+2(6)=86 So, except option (b), others have their EAN equal to the atomic number of nearest noble gas. Hence, option (b) is the correct answer.

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