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Which of the following set contains non-reducing disaccharides?
- a)Sucrose and maltose
- b)Maltose and lactose
- c)Lactose and trehalose
- d)Sucrose and trehalose
Correct answer is option 'D'. Can you explain this answer?
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Which of the following set contains non-reducing disaccharides?a)Sucr...
Non-Reducing Disaccharides
Non-reducing disaccharides are a type of disaccharide that do not contain a free aldehyde or ketone group, which means they cannot be oxidized. Some common examples of non-reducing disaccharides are sucrose and trehalose.
Sucrose and Trehalose
Sucrose is a disaccharide made up of glucose and fructose, while trehalose is a disaccharide made up of two glucose molecules. Both of these disaccharides are non-reducing, meaning they do not react with Benedict's reagent or Tollens' reagent.
Maltose and Lactose
Maltose is a disaccharide made up of two glucose molecules, while lactose is a disaccharide made up of glucose and galactose. Both of these disaccharides are reducing, meaning they can react with Benedict's reagent or Tollens' reagent.
Conclusion
Therefore, the set that contains non-reducing disaccharides is sucrose and trehalose, which are made up of glucose and fructose and two glucose molecules, respectively.
Non-reducing disaccharides are a type of disaccharide that do not contain a free aldehyde or ketone group, which means they cannot be oxidized. Some common examples of non-reducing disaccharides are sucrose and trehalose.
Sucrose and Trehalose
Sucrose is a disaccharide made up of glucose and fructose, while trehalose is a disaccharide made up of two glucose molecules. Both of these disaccharides are non-reducing, meaning they do not react with Benedict's reagent or Tollens' reagent.
Maltose and Lactose
Maltose is a disaccharide made up of two glucose molecules, while lactose is a disaccharide made up of glucose and galactose. Both of these disaccharides are reducing, meaning they can react with Benedict's reagent or Tollens' reagent.
Conclusion
Therefore, the set that contains non-reducing disaccharides is sucrose and trehalose, which are made up of glucose and fructose and two glucose molecules, respectively.
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Which of the following set contains non-reducing disaccharides?a)Sucr...
Sugars are categorised as reducing and non-reducing based on their reactivity towards Tollen's reagent or Fehling solution, a qualitative test. These solutions contain cupric ions (Cu2+). The cupric ions (Cu2+) oxidise the sugars only when they are in linear form, which exists in equilibrium with the cyclic structures. The carbonyl carbon of sugar is oxidized to a carboxyl group. They form enediols, which are converted into aldonic acids and a mixture of acids under alkaline conditions. This results in the reduction of cupric ions (Cu2+) into a cuprous form (Cu+). The cuprous ions form a red cuprous oxide precipitate. Thus, sugars capable of reducing cupric ions into cuprous ions are called reducing sugars and the others as non-reducing sugars.
The concentration of sugars can also be estimated by measuring the amount of oxidizing agents reduced. Earlier, this test was used to measure blood glucose levels in diabetic patients.
Their reactivity with Fehling’s solution is dependent on whether the sugar molecule has free aldehyde or ketone group available or not. If the sugars have free aldehyde or ketone group, it can be oxidized by cupric ions. Hence, they are categorised as reducing sugars such as monosaccharides.
All monosaccharides are reducing sugars, and certain disaccharides such as lactose and maltose are also reducing sugars.
The others do not have such free groups; they do not reduce cupric into cuprous ions, are termed non-reducing sugars. Some disaccharides such as sucrose and trehalose and polysaccharides such as sucrose belong to this category.
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Which of the following set contains non-reducing disaccharides?a)Sucrose and maltoseb)Maltose and lactosec)Lactose and trehalosed)Sucrose and trehaloseCorrect answer is option 'D'. Can you explain this answer?
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