QJEEM02Ch205f: JEE Main 2002 Chemistry - Class 12 JEEM02Ch205f Solution: The most stable ion is :

Question

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The most stable ion is :

Accepted Answer

The cyano and hydroxo complexes are far more stable than those formed by halide ion. This is due to the fact that

C{N^ - }

and

O{H^ - }

are strong lewis bases (nucleophiles). Further

{\left[ {Fe{{\left( {OH} \right)}_5}} \right]^{3 - }}

is not formed. hence most stable ion is

{\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}

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