Mark one bond angle on each of complexes P, Q, R and S, and give its value in degrees.
State the shapes of complexes P, Q, R and S.
In each of complexes P, Q, R and S, two L ligands are replaced by two different monodentate ligands X and Y. Identify every complex that gives a new complex showing geometrical isomerism.
In each of complexes P, Q and R, three L ligands are replaced by three different monodentate ligands X, Y and Z. Identify every complex that forms a new complex showing optical isomerism.
State the reagent and conditions for this reaction.
Complete the overall equation for this reaction. An atom of oxygen from the oxidising agent is shown as $[\text{O}]$. All atoms in the two ethyl groups are completely oxidised in this reaction. $(\text{1,2-diethylbenzene}) + \ldots [\text{O}] \rightarrow \text{C}_6\text{H}_4(\text{COOH})_2 + \ldots + \ldots$
Predict how many peaks would be seen in the carbon-13 NMR spectrum of benzene-1,2-dioic acid.
Explain why $\text{CDCl}_3$ is used as the solvent instead of $\text{CHCl}_3$ when these spectra are obtained.