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प्रश्न
Explain the preparation of glucose from sucrose.
Write chemical reaction for the preparation of glucose from sucrose.
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उत्तर
- Sucrose is hydrolysed by warming with dilute hydrochloric acid or sulfuric acid for about two hours.
- This hydrolysis converts sucrose into a mixture of glucose and fructose.
- Glucose is separated from fructose by adding ethanol during cooling.
- Glucose being almost insoluble in alcohol crystallizes out first. The solution is filtered to obtain crystals of glucose. The reaction can be given as,
\[\ce{\underset{Sucrose}{C12H22O11} + H2O ->[H+][\Delta] \underset{Glucose}{C6H12O6} + \underset{Fructose}{C6H12O6}}\]
संबंधित प्रश्न
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
Draw the structure of the pyran.
Which of the following type of carbohydrates cannot be hydrolyzed?
From the following identify an example of disaccharides.
Which of the following monosaccharides is a tetrose sugar?
Which of the following carbohydrate is sweet to taste?
The reserve food material in animals is ____________.
Identify the sugar having the molecular formula C6H1206.
Fructose is the fruit sugar and chemically it is ketohexose but it has a ______ rather than a ______.
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 |
____________ do not give smaller sugar units on hydrolysis.
Which carbon atoms of α- D glucopyranose and β-D-fructofuranose respectively are linked together to form glycosidic linkage in sucrose?
Prolonged heating of glucose with hot HI results in the formation of ____________.
4-O-(α-D-Glucopyranosyl)-D-glucopyranose is ____________.
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?
Glucose and gluconic acid treated with dilute nitric acid forms saccharic acid. What does this indicate?
When 2 moles of stachyose is hydrolyzed, the number of moles of galactose obtained is ____________.
Which of the following statement is NOT true about saccharic acid?
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)
What is the product obtained when Br2 water reacts with glucose?
How many hydroxyl groups are present in Erythrulose?
Which one of the following rotates the plane polarized light towards left?
The number of sp2 and sp3 hybridised carbon in fructose are respectively ____________.
Glucose is an aldose. Which one of the following reactions is not expected with glucose?
Which of the following are epimers?
Why carbohydrates are generally optically active?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Fructose
Write the structure of α-D (+) glucopyranose.
The molecule of glucose is also called ______.
Lactose is made of ______.
Glucose on oxidation with bromine water yields gluconic acid. This reaction confirms the presence of ______.
Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?
Corn is immersed in boiling water. It is then cooled, and the solution becomes sweet. It is due to ______.
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Assign D/L configuration to the following monosaccharides:
Describe the action of the following reagent on glucose:
Bromine water
The linkage present in Lactose is ______.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why are carbohydrates generally optically active?
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?
\[\ce{CH2OH - CO - (CHOH)4 - CH2OH}\] is an example of ______.
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.
