May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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11LipidsHard1 mark
A triglyceride was hydrolysed, producing four different molecules. Which molecule is a saturated fatty acid?
Structure A: glycerol, a three-carbon chain in which each carbon carries an OH group and two H atoms; it has no carboxylic acid group, so it is not a fatty acid.
Structure B: a fatty acid with a carboxylic acid head (HO-C(=O)-) joined to a chain of five carbons linked only by single C-C bonds, each carbon carrying two H atoms (fully saturated).
Structure C: a fatty acid with a carboxylic acid head joined to a hydrocarbon chain containing one C=C double bond (monounsaturated).
Structure D: a fatty acid with a carboxylic acid head joined to a hydrocarbon chain containing two C=C double bonds (polyunsaturated).