May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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38Addition PolymersHard1 mark
The structure of part of an addition polymer chain is shown.
Part of an addition-polymer backbone drawn as a zigzag chain: eight of the backbone carbons each carry a pendant carboxylic acid ($-CO_{2}H$) group (drawn as $HO-C({=}O)-$ or $-C({=}O)-OH$ branching off alternate backbone carbons), with a plain, unsubstituted $-CH_{2}-$ between each pair of acid-bearing carbons and no other branches anywhere along the chain; a short hashed bond stub at each end of the fragment shows the chain continuing beyond what is drawn.
Which row gives the monomer used and the number of repeat units in the structure shown?
Four rows, A to D, each showing a possible monomer structure and a repeat-unit count. Row A: the straight-chain monomer $HO-C({=}O)-CH{=}CH_{2}$ (prop-2-enoic/acrylic acid, no branch on the double-bond carbons), 6 repeat units. Row B: the monomer $HO-C({=}O)-CH{=}CH-CH_{3}$ (but-2-enoic/crotonic acid, with a methyl group on the far carbon of the double bond), 6 repeat units. Row C: the same straight-chain monomer as row A, $HO-C({=}O)-CH{=}CH_{2}$, 8 repeat units. Row D: the same branched monomer as row B, $HO-C({=}O)-CH{=}CH-CH_{3}$, 8 repeat units.