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प्रश्न
Give scientific reasons:
Hydrolysis of sucrose is called inversion.
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उत्तर
1) Sucrose (C12H22O11) is dextrorotatory (+66.5°). On hydrolysis with dilute acid or an enzyme called invertase, sucrose gives equimolar mixture of D-(+)-glucose and D-(–)-fructose.
\[\ce{\underset{\text{Sucrose}}{C12H22O11} + H2O ->[H+][\triangle]\underset{\text{D-(+)-Glucose}}{C6H12O6} + \underset{\text{D-(–)-Fructose}}{C6H12O6}}\]
2) Since the laevorotation of fructose (–92.4°) is larger than the dextrorotation of glucose (+52.7°), the hydrolysis product has net laevorotation.
Hence, hydrolysis of sucrose is also called inversion of sucrose.
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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.
Draw a neat diagram for the following:
Haworth formula of glucopyranose.
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glucose into gluconic acid
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glucose, cellulose, maltose, stachyose
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
Write a commercial method for preparation of glucose.
From the following identify an example of disaccharides.
Which of the following monosaccharides is a tetrose sugar?
Carbohydrates can contain which of the following chemical groups?
The reserve food material in animals is ____________.
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 |
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Identify the number of oxygen atoms present in saccharic acid?
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Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
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Which of the following are epimers?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
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Classify the following into monosaccharides, oligosaccharides and polysaccharides.
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Lactose is made of ______.
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Formation of gluconic acid from glucose by oxidation using Br2 water.
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\[\ce{A <-[Br2 - H2O] Glucose ->[HNO3] B}\]
Here, 'A' and 'B' are respectively.
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Describe the action of the following reagent on glucose:
Bromine water
Describe the action of the following reagent on glucose:
dil. Nitric acid.
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Explain the hydrolysis of sucrose.
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Why are carbohydrates generally optically active?
Why carbohydrates are generally optically active?
Why carbohydrates are generally optically active.
\[\ce{CH2OH - CO - (CHOH)4 - CH2 OH}\] is an example of ______.
\[\ce{CH2OH - CO - (CHOH)4 - CH2OH}\] is an example of ______.
