Q71 · Practice questionSimple familiar4 marks
QUESTION 71 (4 marks)
Two glucose molecules, each , join to form the disaccharide maltose.
a) Determine the molecular formula of maltose and write the overall equation. [2 marks]
b) Name the linkage and explain how hydrolysis reverses its formation. [2 marks]
WORKED SOLUTION
4 marksPractice marking scheme
; glycosidic linkage; water cleaves it, restoring hydroxyl groups.
Condensation removes one water molecule, subtracting H₂O from the combined formula. Hydrolysis uses water to split the glycosidic link and regenerate the monosaccharides.
- Determines C₁₂H₂₂O₁₁. [1 marks]
- Writes balanced condensation equation. [1 marks]
- Names glycosidic linkage. [1 marks]
- Explains water consumption/link cleavage on hydrolysis. [1 marks]
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