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The species that can have a trans-isomer is: (en = ethane-1,2-diamine, ox = oxalate) (1) [Cr(en)2(ox)]+ (2) [Pt(en)Cl2] (3) [Pt(en)2Cl2]2+ (4) [Zn(en)Cl2]

1. (1) [Cr(en)2(ox)]+
2. (2) [Pt(en)Cl2]
3. (3) [Pt(en)2Cl2]2+
4. (4) [Zn(en)Cl2]

Correct answer: (4) [Zn(en)Cl2]

Solution

The correct option is [Zn(en)Cl2] because zinc forms a tetrahedral complex with two bidentate ethylenediamine ligands and two chloride ligands, allowing for the possibility of geometric isomerism, including trans-isomers. In contrast, the other complexes either do not have the necessary geometry or do not allow for trans-isomerism.

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