(a(i))[2]
Draw diagrams to illustrate the three-dimensional structures of the two isomers.
(a(ii))[1]
Comment on the polarity of the two isomers of $\text{Pt}(\text{NH}_3)_2\text{Cl}_2$. Give reasons for your answer.
(a(iii))[1]
Explain why oxaloplatin has no isomers.
(b(i))[1]
What does this suggest about the stereochemistry around the nickel atom?
(b(ii))[1]
Draw a three-dimensional diagram showing the structure of this complex.