Addition polymerisation

2 marks · Normal

State the name of the monomer used to make poly(chloroethene). Draw the displayed formula of the repeat unit of poly(chloroethene).

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Monomer: chloroethene (vinyl chloride). Repeat unit: displayed formula of —CH2—CHCl—.

Must show: Name must be 'chloroethene' or 'vinyl chloride', Repeat unit formula must be —CH2—CHCl— (bracketed with n subscript)

Also accept: Vinyl chloride for the monomer name; Display formula with or without brackets, but structure must show 2 C atoms with single bond, one Cl and 3 H

Common mistakes: Giving ethene as the monomer; Drawing double bond in repeat unit

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Marking points

B1 · 1 mark · States correct name of the monomer (chloroethene or vinyl chloride)

B2 · 1 mark · Draws correct repeat unit structure for poly(chloroethene)

Worked solution

The monomer used is chloroethene (also called vinyl chloride).

The displayed formula of the repeat unit for poly(chloroethene) is: