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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 scientific reasons:
The disaccharide sucrose gives negative Tollens test while the disaccharide maltose gives a positive Tollens test.
Give two evidences for presence of formyl group in glucose.
Draw a neat diagram for the following:
Haworth formula of maltose
Write the name of the polysaccharide used for the commercial preparation of glucose.
Draw the structure of α-D glucopyranose.
Write chemical reaction for following conversions
glucose into glucoxime
Write chemical reaction for following conversions
glucose into gluconic acid
Explain the classification of carbohydrates with examples.
What is the action of the following reagents on glucose?
hydroxylamine
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
Explain D and L configuration in sugars.
Write a commercial method for preparation of glucose.
Which of the following type of carbohydrates cannot be hydrolyzed?
From the following identify an example of disaccharides.
Which enzymes would work sequentially on potatoes consumed by an individual?
Which of the following monosaccharides is a tetrose sugar?
______ is the prosthetic group of glycoproteins.
Fructose is the fruit sugar and chemically it is ketohexose but it has a ______ rather than a ______.
By which of the following feature we can identify the relatively small DNA molecules of plasmids?
Identify a non-reducing carbohydrate from the following.
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 |
Chitin is a/an ______.
The number of asymmetric carbon atoms in the glucose molecule is ____________.
Monosaccharides are ______ in nature.
From the following identify the two types of glucose polymers present in starch.
Which reagent among the following is used to confirm presence of aldehydic carbonyl group in glucose?
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
Identify the INCORRECT statement regarding glucose.
Which one of the following is an oligosaccharide?
The general formula for polysaccharide is ____________.
Which one of the following carbohydrates is insoluble in water?
Which one of the following is NOT soluble in water?
Which of the following statements is NOT true for glyceraldehyde?
Which among the following statements is true for amylose?
What is the number of hydroxyl groups present in lactic acid?
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?
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?
Which among the following reagents is used to obtain gluconic acid from glucose?
What is the product obtained when Br2 water reacts with glucose?
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives equal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Glucose is an aldose. Which one of the following reactions is not expected with glucose?
The molecule of glucose is also called ______.
Lactose is made of ______.
A molecule of stachyose contains how many carbon atoms?
Starch and cellulose are compounds made up of many units of ______.
Which one is a non-reducing commercial sugar?
Formation of gluconic acid from glucose by oxidation using Br2 water.
Consider the following reaction
\[\ce{A <-[Br2 - H2O] Glucose ->[HNO3] B}\]
Here, 'A' and 'B' are respectively.
Why carbohydrates are generally optically active.
Describe the action of the following reagent on glucose:
Bromine water
Carbohydrates that do not undergo hydrolysis further are called ______.
Write Fischer projection formulae for glucose.
The linkage present in Lactose is ______.
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Two monosaccharides are held together by ______ bond.
What are the number of chiral carbon atoms and the number of formyl groups, respectively, present in ribose?
