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Chemistry Question 59 – JEE-MAIN 2025

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Given below are two statements: Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism Statement II : cis- and trans - platin are heteroleptic complexes of Pd. In the light of the above statements, choose the correct answer from the options given below

Recall the definitions of homoleptic/heteroleptic complexes and the conditions for stereoisomerism in coordination compounds.

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Ninja Strategy•Careful Ligand and Metal Identification

Precisely identify the central metal and ligand types for each complex to correctly classify them and determine isomerism.

Step 1: Analyze Statement I for Stereoisomerism✦ Active

A homoleptic octahedral complex with monodentate ligands has the general formula MA6. In such a complex, all six ligands are identical. There is only one possible arrangement of these ligands around the central metal atom, meaning it cannot exhibit geometrical isomerism (cis/trans) or optical isomerism. Thus, it will not show stereoisomerism.

Therefore, Statement I is TRUE.

Step 2: Analyze Statement II for Heteroleptic Nature and Central Metal○ Expand

cis-platin and trans-platin have the chemical formula cis−[Pt(NH3)2Cl2] and trans−[Pt(NH3)2Cl2] respectively. These complexes contain two different types of ligands (NH3 and Cl), which makes them heteroleptic complexes. However, the central metal atom in both cis- and trans-platin is Platinum (Pt), not Palladium (Pd).

Since the statement specifies 'complexes of Pd', which is incorrect, Statement II is FALSE.

Step 3: Combine the Results○ Expand

Statement I is true, and Statement II is false. This corresponds to option 3.

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