Chemistry 9701 · AS & A Level · Atoms, molecules and stoichiometry

Atoms, molecules and stoichiometry — practice question

Disaccharides, $\text{C}_{12}\text{H}_{22}\text{O}_{11}$, play an important role in the human diet. For instance, sucrose occurs in pastries, whereas lactose is present in milk products. Both compounds may undergo hydrolysis. $\text{sucrose} + \text{H}_2\text{O} \rightarrow \text{CH}_2\text{OH(CHOH)}_4\text{CHO} + \text{CH}_2\text{OH(CHOH)}_3\text{COCH}_2\text{OH}$ glucose            fructose $\text{lactose} + \text{H}_2\text{O} \rightarrow \text{CH}_2\text{OH(CHOH)}_4\text{CHO} + \text{CH}_2\text{OH(CHOH)}_4\text{CHO}$ glucose            galactose Which of the following statements about the products of these hydrolysis reactions is/are correct?

  • A1, 2 and 3 are correct
  • B1 and 2 only are correct
  • C2 and 3 only are correct
  • D1 only is correct

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