A) \[{{[Fe{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3-}}<{{[Fe{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
B) \[{{[Fe(edta)]}^{-}}>{{[Fe{{(en)}_{3}}]}^{3+}}\]
C) \[{{\left[ Ni{{\left( en \right)}_{2}} \right]}^{2+}}>\left[ Ni{{\left( dmg \right)}_{2}} \right]\]
D) \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}>{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]
Correct Answer: C
Solution :
[c] As number of stable rings increases stability of complex compound also increases due to chelation effect. Number of rings in \[{{[Ni{{(en)}_{2}}]}^{2+}}=2\] Number of rings in \[\left[ Ni{{(dmg)}_{2}} \right]=4\]
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