How to deduce the polymerisation reaction for any alkene
2 marks · EasyThe repeat unit of a polymer is shown below:
Explain how you can deduce the structure of the monomer used to form this polymer.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Break the single bond between the two carbons in the repeat unit and insert a double bond to get the monomer: .
Also accept: Stating that the monomer is tetrafluoroethene, formula
Common mistakes: Leaving the structure as a single bond; Forgetting to include the double bond; Adding extra atoms not present in the repeat unit
Show mark scheme and worked solution
Marking points
M1 · 1 mark · States or shows that you open up the repeat unit between the two carbons and insert a double bond.
A1 · 1 mark · Gives the correct monomer structure: .
Worked solution
To deduce the monomer from the polymer repeat unit:
Split the repeat unit at the single bond between the two carbon atoms.
Insert a double bond between the carbons.
The structure of the monomer is (tetrafluoroethene).