Addition polymerisation

2 marks · Hard

The structure below shows part of a polymer chain.

State the name of the monomer used to make this polymer. Draw the displayed formula of the repeat unit for 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.

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(a) chloroethene (vinyl chloride)

(b) Displayed formula of —CH2–CHF— as the repeat unit, with extension bonds at each end · must show Correct connectivity of atoms for —CH2–CHF—, Displayed formula with extended bonds

Common mistakes: Giving polymer name rather than monomer; Incorrectly drawing the repeat unit with a double bond

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correctly names the monomer as chloroethene (vinyl chloride)

B2 · 1 mark · Correct displayed formula of the polymer's repeat unit (—CH2–CHF—), showing extension bonds at both ends

Worked solution

a) The monomer is chloroethene (also called vinyl chloride) with the formula .

b) The displayed formula of the repeat unit is:

Drawn as: H F | | C—C | | H H with bonds extending left and right.