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Questions
Explain the preparation of glucose from sucrose.
Write chemical reaction for the preparation of glucose from sucrose.
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Solution
- 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,
\[\ce{\underset{Sucrose}{C12H22O11} + H2O ->[H+][\Delta] \underset{Glucose}{C6H12O6} + \underset{Fructose}{C6H12O6}}\]
RELATED QUESTIONS
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Draw a neat diagram for the following:
Haworth formula of glucopyranose.
Draw a neat diagram for the following:
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Write the name of the unit to which glucose unit is linked to from sucrose.
Write chemical reaction for following conversions
glucose into glucoxime
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glucose, cellulose, maltose, stachyose
Explain the classification of carbohydrates with examples.
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acetic anhydride
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
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Identify the substances having glycosidic bond and peptide bond, respectively in their structure:
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From the following identify the group that is exclusively consists of polysaccharides.
From the following which is a heteropolysaccharide?
Identify the WRONG statement.
Which among the following compounds is obtained when glucose reacts with hydrogen cyanide?
Identify a non-reducing carbohydrate from the following.
Which is the product obtained, when Br2 water reacts with glucose?
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 ______.
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 ____________.
Identify the INCORRECT statement regarding glucose.
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\[\ce{CH3 - CH2 - CH2 - Br ->[Na][dry ether] A ->[Cl2] B}\]
Identify the product B in the above reaction.
Which one of the following is Tetrose sugar?
Which of the following statements is NOT true for glyceraldehyde?
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?
What is the molecular formula of glyceraldehyde?
Which among the following observations suggests that glucose also exists in cyclic form?
How many optical isomers are possible for a compound having four asymmetric carbon atoms?
The number of sp2 and sp3 hybridised carbon in fructose are respectively ____________.
Which of the following are epimers?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
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Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.
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\[\ce{A <-[Br2 - H2O] Glucose ->[HNO3] B}\]
Here, 'A' and 'B' are respectively.
Why carbohydrates are generally optically active?
Explain the hydrolysis of sucrose.
Write the ring structure of glucose.
Why carbohydrates are generally optically active.
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.
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What are the number of chiral carbon atoms and the number of formyl groups, respectively, present in ribose?
