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JAMB Chemistry 2012 Question 43

Question 43

Carbohydrates, Proteins and Amines

Carbohydrates are large molecules with the molecular formula Cx(H2O)y. In which of the following pairs is x not equal to y?

  1. A.Glucose and starch
  2. B.Maltose and fructose
  3. C.Sucrose and fructose
  4. D.Maltose and starch.
Show the answer and explanation

Answer: D (Maltose and starch.)

Explanation

Maltose is C12(H2O)11 and starch (C6H10O5)n is C6n(H2O)5n, so x ≠ y for both. Glucose and fructose are C6(H2O)6 (x = y).