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Which of the following statements regarding the structure and properties of carbohydrates is INCORRECT?

Options

  1. ASucrose is a non-reducing sugar because its glycosidic linkage involves C ₁ of -D-glucose and C ₂ of -D-fructo
  2. BMaltose is a reducing sugar composed of two -D-glucose units linked by an -1,4-glycosidic bond.
  3. CAmylose is a linear polymer of -D-glucose units held together by C ₁- C ₄ glycosidic linkages.
  4. DLactose is a non-reducing sugar because it contains a -1,4-glycosidic linkage between -D-galactose and -D-gluc

Correct answer

D. Lactose is a non-reducing sugar because it contains a -1,4-glycosidic linkage between -D-galactose and -D-gluc

Step-by-step solution

Let us evaluate each statement: Sucrose is formed by a glycosidic linkage between C ₁ of -D-glucose and C ₂ of -D-fructose. Since both anomeric carbons are involved in the bond, it is a non-reducing sugar. This statement is correct. Maltose is composed of two -D-glucose units linked at C ₁ and C ₄ . The anomeric carbon of the second glucose unit is free, making it a reducing sugar. This statement is correct. Amylose is a linear component of starch, formed by -D-glucose units joined by C ₁- C ₄ glycosidic linkages.

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