Question

Identify the most stable complex. 1. \( \left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3} \) 2. \( \left[ CoCl _{2}(\text { en })_{2}\right] Br \) 3. \( \left[ Co ( en )_{3}\right] Cl _{3} \) 4. \( K \left[ CoCl _{4}( en )\right] \) Options 1.1 2. 2 3. 3 4. 4

Answer 1

3. [Co(en)₃]Cl₃

_{This compound is the most stable one since it contains 3 ethylenediamine ligands which are bidentate in nature. Options 1,2 and 4 contain 0,2 and 1 such ligands respectively and are less stable.}