Answer the following questions: The compound also known as cis-platin, is used in chemotherapy. It…
Answer the following questions:
(i)
The compound $[\text{PtCl}_2(\text{NH}_3)_2]$ also known as cis-platin, is used in chemotherapy. It also demonstrates how coordination geometry impacts medical science.
(a) Write its IUPAC name and the type of isomerism it exhibits.
(b) What is the geometry of the compound?
(ii)
What type of structural isomers are $[\text{Pt}(\text{NH}_3)_3\text{Br}]\text{NO}_3$ and $[\text{Pt}(\text{NH}_3)_3(\text{NO}_3)]\text{Br}$? How can they be distinguished by using a chemical test?
(iii)
A coordination compound $\text{CoCl}_3\cdot4\text{H}_2\text{O}$ precipitates silver chloride when treated with silver nitrate. The molar conductance of its solution corresponds to a total of two ions. Write the structural formula of the compound and name it.
Answer
Answer (i)
AIWritten by AI (gemini) - it can contain mistakes.
(a) IUPAC name: diamminedichloridoplatinum(II). Type of isomerism: Geometrical isomerism (cis and trans isomers).
(b) Geometry: Square planar.
Answer (ii)
AIWritten by AI (gemini) - it can contain mistakes.
They are ionisation isomers. Chemical test: An aqueous solution of $[\text{Pt}(\text{NH}_3)_3\text{Br}]\text{NO}_3$ gives no precipitate with $\text{AgNO}_3$ but gives brown ring test for nitrate ion; an aqueous solution of $[\text{Pt}(\text{NH}_3)_3(\text{NO}_3)]\text{Br}$ gives a pale yellow precipitate of $\text{AgBr}$ with $\text{AgNO}_3$ that is sparingly soluble in dilute $\text{NH}_4\text{OH}$.
Answer (iii)
AIWritten by AI (gemini) - it can contain mistakes.
Structural formula: $[\text{Co}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}$ (which ionises into $[\text{Co}(\text{H}_2\text{O})_4\text{Cl}_2]^+$ and $\text{Cl}^-$, giving 2 ions in solution and precipitating 1 mole of AgCl per mole of complex).
Name: tetraaquadichloridocobalt(III) chloride.
From ISC 2027 Specimen Chemistry Paper 1, question 20.