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Question:

Which of the following complexes will show geometrical isomerism?

potassium amminetrichloroplatinate (II)

potassium tris(oxalato) chromate (III)

aquachlorobis (ethylenediamine) cobalt (II) chloride

pentaquachlorochromium (III) chloride

Solution:

Aquachlorobis (ethylenediamine) cobalt (II) chloride will show geometrical (cis-trans) isomerism. In cis isomer, two ethylene diamine ligands are adjacent and in trans isomer, they are opposite to each other.