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प्रश्न
Give two evidences for presence of formyl group in glucose.
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उत्तर
- Glucose gets oxidized to a six-carbon monocarboxylic acid called gluconic acid on reaction with bromine water which is a mild oxidizing agent. Thus, the carbonyl group in glucose is in the form of formyl (–CHO).
- Hemiacetal group of glucopyranose structure is a potential aldehyde (formyl) group. It imparts reducing properties to glucose. Thus, glucose gives positive Tollen’s test or Fehling test.
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संबंधित प्रश्न
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Draw the structure of α-D glucopyranose.
What is the action of the following reagents on glucose?
hydrogen iodide
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
Write a commercial method for preparation of glucose.
What is monosaccharide?
By which of the following process formation of glycosidic bond occurs?
Identify the given structure 'P' and 'Q'.
From the following identify an example of disaccharides.
Which of the following monosaccharides is a tetrose sugar?
Formation of lactose by conden ation results in the release of how many molecules of water?
Carbohydrates can contain which of the following chemical groups?
From the following which is a heteropolysaccharide?
______ is the prosthetic group of glycoproteins.
Identify the WRONG statement.
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 |
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?
Which carbon atoms of α- D glucopyranose and β-D-fructofuranose respectively are linked together to form glycosidic linkage in sucrose?
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
Which of the following monosaccharide is a ketohexose?
Glucose and gluconic acid treated with dilute nitric acid forms saccharic acid. What does this indicate?
Which of the following molecules reduces Fehling's solution?
Which one of the following sugar does NOT have same empirical fonnula as that of carbohydrate?
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.
Which among the following reagents is used to confirm the presence of carbonyl group in glucose?
Which among the following sugars does not reduce Tollen's reagent?
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)
What is the molecular formula of glyceraldehyde?
How many moles of acetic acid are obtained in the reaction when one mole glucose is treated with excess acetic anhydride?
Which one of the following rotates the plane polarized light towards left?
α-D (+) Glucose and β-D (+) glucose are ____________.
Which of the following are epimers?
Why carbohydrates are generally optically active?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Fructose
Lactose is made of ______.
Describe the action of the following reagent on glucose:
dil. Nitric acid.
Write the ring structure of glucose.
Why carbohydrates are generally optically active.
The linkage present in Lactose is ______.
Write the Zwitter ion structure of alanine.
Why carbohydrates are generally optically active?
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active.
Given below are two statements.
Statement I - Lactose on hydrolysis converts into glucose and galactose.
Statement II - Galactose also plays same role as glucose in respiration.
In light of the above statements, select the correct option given below.
Which of the following is used to separate glucose and fructose from hydrolysate of sucrose?
