How to deduce the polymerisation reaction for any alkene

2 marks · Hard

The displayed formula below shows the repeat unit of a polymer formed by addition polymerisation.

State the name and molecular formula of the monomer that forms 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

fluoroethene; CH2=CHF

Also accept: vinyl fluoride; CH2=CHF

Common mistakes: Giving the polymer name instead of the monomer; Writing the repeat unit formula instead of the monomer formula

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct name: fluoroethene or vinyl fluoride.

B2 · 1 mark · Correct molecular formula: CH2=CHF.

Worked solution

The repeat unit -\ce{CH2-CHF}- comes from the monomer with the same atoms but with a double bond: CH2=CHF.

This monomer is fluoroethene (or vinyl fluoride).