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प्रश्न
What are reducing and non-reducing sugars?
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उत्तर
1. Reducing sugars: Those carbohydrates which contain free aldehyde or ketonic group and reduces Fehling’s solution and Tollen’s reagent are called reducing sugars. All monosaccharides whether aldose or ketone are reducing sugars.
2. Non-reducing sugars: Carbohydrates that do not reduce Tollen’s reagent and Fehling’s solution are called non – reducing sugars. Example Sucrose. They do not have a free aldehyde group.
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संबंधित प्रश्न
Give two evidences for presence of formyl group in glucose.
Draw a neat diagram for the following:
Haworth formula of maltose
Draw the structure of α-D glucopyranose.
Classify the following carbohydrates into monosaccharide, disaccharide, oligosaccharide and polysaccharide:
glucose, cellulose, maltose, stachyose
What is the action of the following reagents on glucose?
hydrogen iodide
Write a chemical reaction to convert glucose into glucose cyanohydrin.
Identify the bond that links the carbon of two adjacent monosaccharides.
Identify the given structure 'P' and 'Q'.
From the following identify an example of disaccharides.
Carbohydrates can contain which of the following chemical groups?
From the following identify the group that is exclusively consists of polysaccharides.
Match the Column I and Column II select the correct option.
| Column I | Column II | ||
| i. | Monosaccharides | a. | Stored energy in animals |
| ii. | Glycogen | b. | Polymer made from ß-glucose molecules |
| iii. | Cellulose | c. | Exoskeleton of arthropods |
| iv. | Chitin | d. | Building blocks of carbohydrates |
| e. | Plant hormone |
The number of asymmetric carbon atoms in the glucose molecule is ____________.
From the following identify the two types of glucose polymers present in starch.
Identify the CORRECT combination.
Which reagent among the following is used to confirm presence of aldehydic carbonyl group in glucose?
Which carbon atoms of α- D glucopyranose and β-D-fructofuranose respectively are linked together to form glycosidic linkage in sucrose?
Which among the following type of linkages is present in cellulose?
Raffinose, sucrose and stachyose are respectively ____________.
Identify the INCORRECT statement regarding glucose.
Which element among the following is not present in saccharine?
Which one of the following is an oligosaccharide?
Which one of the following carbohydrates is insoluble in water?
Which one of the following is NOT soluble in water?
Which of the following molecules reduces Fehling's solution?
Which following reagent is used to detect presence of five hydroxyl groups in a glucose molecule?
Which among the following statements is true for amylose?
How many moles of fructose and galactose respectively are obtained on hydrolysis of 1 mole stachyose?
Identify the number of secondary carbon atoms in glucose.
When 2 moles of stachyose is hydrolyzed, the number of moles of galactose obtained is ____________.
Which among the following reagents is used to confirm the presence of carbonyl group in glucose?
On hydrolysis sucrose gives ____________.
What is the quantity of glucose obtained when 68.4 g of sucrose is hydrolyzed in laboratory under ideal condition?
(Molar mass of sucrose = 342 g mol−1)
Which among the following reagents is used for conversion of glucose to glucoxime?
What is the molecular formula of glyceraldehyde?
What is the product obtained when Br2 water reacts with glucose?
When one mole of lactose is hydrolysed, the hydrolysate contains ____________.
How many optical isomers are possible for a compound having four asymmetric carbon atoms?
Which one given below is a non-reducing sugar?
Complete hydrolysis of cellulose gives ____________.
α-D (+) Glucose and β-D (+) glucose are ____________.
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Starch
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Fructose
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Sucrose
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Lactose
If 'n' represents total number of asymmetric carbon atoms in a compound, then the possible· number of optical isomers of the compound is ______.
Glucose on oxidation with bromine water yields gluconic acid. This reaction confirms the presence of ______.
Starch and cellulose are compounds made up of many units of ______.
Formation of gluconic acid from glucose by oxidation using Br2 water.
\[\ce{CH2OH - CO - (CHOH)4 - CH2OH}\] is an example of ______.
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active?
Describe the action of the following reagent on glucose:
dil. Nitric acid.
Carbohydrates that do not undergo hydrolysis further are called ______.
Explain the hydrolysis of sucrose.
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why are carbohydrates generally optically active?
Why carbohydrates are generally optically active.
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
The sugar found in milk is ______.
