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JEE MainChemistryCoordination Compounds

Consider the following coordination complexes: [ Pt ( NH ₃ )₂ Cl ₂ ] , [ NiCl ₂ ( PPh ₃ )₂ ] , [ Co ( NH ₃ )₄ Cl ₂ ]⁺ , [ Ni ( NH ₃ )₄ ( H ₂ O )₂ ]²⁺ , [ Cr ( H ₂ O )₄ Cl ₂ ]⁺ and [ Zn ( NH ₃ )₄ ]²⁺ The sum of the number of unpaired electrons present ONLY in those complexes which can exhibit geometrical isomerism is ____.

Correct answer

5

Step-by-step solution

First, we identify which of the given complexes exhibit geometrical isomerism (GI): 1) [ Pt ( NH ₃ )₂ Cl ₂ ] : Pt ²⁺ forms square planar complexes. This is of type MA ₂ B ₂ , which shows cis and trans isomerism (GI present). 2) [ NiCl ₂ ( PPh ₃ )₂ ] : Ni ²⁺ with bulky PPh ₃ and weak Cl ⁻ forms a tetrahedral complex. Tetrahedral complexes do not show GI (GI absent). 3) [ Co ( NH ₃ )₄ Cl ₂ ]⁺ : Octahedral complex of type MA ₄ B ₂ , which shows cis and trans isomerism (GI present). 4) [ Ni ( NH ₃ )₄ ( H ₂ O )₂ ]²⁺ : O

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