[SOLVED] Which of the following complexes or complex ions has geometric (cis/trans) isomers?

Which of the following complexes or complex ions has geometric (cis/trans) isomers?

[Cr(NH3)4Cl2]+

[Co(NH3)2Cl2]2– (tetrahedral)

[Pt(NH3)2Cl2] (square planar)

[Cr(NH3)5Cl]2+

Answer:

The first and third.

The first three complexes can have cis and trans isomers. This is based on the ratio of compounds bonded to the metal ion. As there is at least two of both in the first three complexes, both cis and trans isomers can be formed.

The last compound however can only be Cis as there are too many Cl for a trans isomer to be formed.

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