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Question

Which of the following statement is not true?


  1. Lactose contains α-glycosidic linkage between C1of galactose and C4of glucose

  2. Lactose is a reducing sugar and give fehling's test

  3. On acid hydrolysis, Lactose give one molecule of D(+) Glucose and one molecule of D(+) Galactose

  4. Lactose (C11H22O11)is a disaccharide and it contains 8hydroxyl groups.

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Solution

The correct option is A

Lactose contains α-glycosidic linkage between C1of galactose and C4of glucose


The correct option is option A

The explanation for the correct option:

  1. Lactose is a disaccharide and it naturally occurs in both cow's milk and human milk.
  2. It has units of galactose and glucose.
  3. These units are joined together by 1-4, beta-oriented glycosidic linkages.
  4. Since Lactose contains an aldehyde group (-CHO) that is oxidized into (-COOH) when it reacts with an oxidant like Fehling's or Benedict's reagent, and hence Lactose is referred to as a "reducing sugar".
  5. One equivalent of D-Glucose and one equivalent of D-Galactose are produced by the acidic hydrolysis of Lactose.
  6. Some people are unable to digest Lactose and this condition is referred to as lactose intolerance.

Lactose contains α-glycosidic linkage between C1of galactose and C4of glucose is the incorrect statement.


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