May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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36Condensation PolymersMedium1 mark
Alanine is an amino acid. The structural formula of alanine is shown.
structural formula of alanine: an NH2 group and a CH3 group both bonded to a central carbon, which is bonded to H and to a C(=O)OH carboxylic acid group
It is the only monomer in a polymer. Which diagram represents a section of this polymer?
four candidate polymer chain diagrams A to D, each repeating a CH3-substituted backbone unit linked by amide (C(=O)-N-H) or ester (C(=O)-O) bonds