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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
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.
Write the name of the polysaccharide used for the commercial preparation of glucose.
Write chemical reaction for following conversions
glucose into gluconic acid
Define carbohydrates.
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
Write a chemical reaction to convert glucose into glucose cyanohydrin.
Write a commercial method for preparation of glucose.
What is monosaccharide?
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?
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?
Identify the sugar having the molecular formula C6H1206.
Which among the following compounds is obtained when glucose reacts with hydrogen cyanide?
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 ____________.
Match the columns and select the correct option.
| Column I | Column II | ||
| i. | Starch | a. | Animal storage molecule |
| ii. | Cellulose | b. | Plant storage molecule |
| iii. | Glycogen | c. | Heparin |
| iv. | Heteropolysaccharide | d. | Plant cell wall component |
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?
Prolonged heating of glucose with hot HI results in the formation of ____________.
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
Stachyose is ____________.
Which one of the following is a carbohydrate but does NOT follow the general formula of carbohydrate?
Which one of the following is NOT soluble in water?
Which of the following statements is NOT true for glyceraldehyde?
Glucose and gluconic acid treated with dilute nitric acid forms saccharic acid. What does this indicate?
Which among the following statements is true for amylose?
Which one of the following sugar does NOT have same empirical fonnula as that of carbohydrate?
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?
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?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Lactose
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Maltose
If 'n' represents total number of asymmetric carbon atoms in a compound, then the possible· number of optical isomers of the compound is ______.
The two monosaccharides in a disaccharide are held together by ______ bonds.
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.
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active?
Why carbohydrates are generally optically active.
The linkage present in Lactose is ______.
Write the Zwitter ion structure of alanine.
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Two monosaccharides are held together by ______ bond.
