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JEE MainChemistryCoordination Compounds

The total number of isomers (including both structural and stereoisomers) possible for the complex ion [ Co ( en )₂( NO ₂)( SCN ) ]⁺ is ____

Correct answer

12

Step-by-step solution

The given complex ion contains two different ambidentate ligands: NO ₂⁻ (can coordinate through N or O) and SCN ⁻ (can coordinate through S or N). First, determine the number of linkage isomers: 1. - NO ₂ and - SCN 2. - ONO and - SCN 3. - NO ₂ and - NCS 4. - ONO and - NCS There are 2 2 = 4 linkage combinations. For each linkage combination, the complex is of the type [ M ( AA )₂ bc ] . This geometry exhibits both geometrical and optical isomerism: - The trans isomer has a plane of symmetry and is optically inactive

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