A) \[{{K}_{3}}\left[ Co{{\left( CN \right)}_{6}} \right]\]
B) \[{{K}_{2}}\left[ CoC{{l}_{4}} \right]\]
C) \[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}Cl \right]\text{ }C{{l}_{2}}\]
D) \[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}\left( {{H}_{2}}O \right)C{{l}_{3}} \right]\]
Correct Answer: A
Solution :
Complex \[{{K}_{3}}\,\left[ Co{{\left( CN \right)}_{6}} \right]\] have \[C{{N}^{-}}\] ligand which is a strong field ligand amongst the given ligands in all complexes, therefore CFSE is highest.
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