May/June 2026 Paper 21

2026 · 5 questions · 38 parts · 60 marks

0/60 marks
0Correct0Partial0Wrong38Unattempted
Filters0 active

Questions

Select a part to jump to its question

Finish set
Context for question 5
Figure 5.1 describes a sequence of reactions starting with ethene to produce poly(chloroethene), PVC.
5(a)Molecular Shape PolarityEasy2 marks
For each compound, select the type of hybridisation of its carbon atoms.
1,2-dichloroethane
chloroethene
5(b)AlkenesEasy1 mark
In reaction 1, ethene reacts with Cl(g) at room temperature. Name the mechanism for reaction 1.
5(c)Organic Reaction Types MechanismsEasy2 marks
Describe what is meant by heterolytic fission of a covalent bond.

Answer

0 words
5(d)AlkenesHard4 marks
Complete Figure 5.2 to show the mechanism for the reaction of ethene with Cl in reaction 1. Include charges, dipoles, lone pairs of electrons and curly arrows, as appropriate.
Diagram to annotate
PenEraserUndoRedoClear
Draw with the mouse or a finger.
5(e)Organic Reaction Types MechanismsEasy1 mark
When 1,2-dichloroethane is heated in reaction 2, thermal decomposition occurs. The reaction is endothermic. State the type of reaction that occurs.
5(f)Addition PolymersEasy1 mark
Draw the repeat unit of poly(chloroethene).
PenEraserUndoRedoClear
Draw with the mouse or a finger.
5(g)(i)Mass Spectrometry Infrared SpectroscopyMedium2 marks
Figure 5.3 shows the mass spectrum of chloroethene.
Figure 5.3, the mass spectrum of chloroethene: a bar chart of relative abundance (y-axis, 0 to 100) against m/e (x-axis, roughly 20 to 68), with small peaks around m/e 25-26, a very tall peak (100%) around m/e 27, a smaller isolated peak around m/e 35, tiny peaks around m/e 48-49, and a pair of peaks at m/e 62 (about 77%) and m/e 64 (about 23%)
Identify the species responsible for the peaks at and .
Species at
0 words
Species at
0 words
5(g)(ii)Mass Spectrometry Infrared SpectroscopyMedium2 marks
Explain the difference in relative abundance of the peaks at and .

Answer

0 words