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The species that can have a trans-isomer is: (en = ehane-1, 2-diamine, ox = oxalate)

1. [Cr(en) 2 (ox)] +
2. [Pt(en)Cl 2 ]
3. [Pt(en) 2 Cl 2 ] 2+
4. [Zn(en)C1 2 ]

Correct answer: [Pt(en) 2 Cl 2 ] 2+

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