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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 a neat diagram for the following:
Haworth formula of maltose
Glucose on oxidation with dilute nitric acid gives _______________
Write the name of the polysaccharide used for the commercial preparation of glucose.
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glucose into glucoxime
Write chemical reaction for following conversions
glucose into gluconic acid
Classify the following carbohydrates into monosaccharide, disaccharide, oligosaccharide and polysaccharide:
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 given structure 'P' and 'Q'.
Identify the substances having glycosidic bond and peptide bond, respectively in their structure:
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Identify the CORRECT combination.
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The general formula for polysaccharide is ____________.
Which one of the following is Tetrose sugar?
Which of the following statements is NOT true for glyceraldehyde?
How many moles of fructose and galactose respectively are obtained on hydrolysis of 1 mole stachyose?
Which of the following statement is NOT true about saccharic acid?
Identify the number of oxygen atoms present in saccharic acid?
How many hydroxyl groups are present in Erythrulose?
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\[\ce{Glucose ->[(HCN)] Product ->[(hydrolysis)] Product ->[(HI + Heat)] A}\], the compound A is:
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives equal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Complete hydrolysis of cellulose gives ____________.
α-D (+) Glucose and β-D (+) glucose are ____________.
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Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Sucrose
Is the following sugar, D-sugar or L-sugar?
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The two monosaccharides in a disaccharide are held together by ______ bonds.
Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?
Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.
Starch and cellulose are compounds made up of many units of ______.
Formation of gluconic acid from glucose by oxidation using Br2 water.
Why carbohydrates are generally optically active.
Assign D/L configuration to the following monosaccharides:
Carbohydrates that do not undergo hydrolysis further are called ______.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why carbohydrates are generally optically active.
Write the Zwitter ion structure of alanine.
Why carbohydrates are generally optically active.
Two monosaccharides are held together by ______ bond.
Which of the following is used to separate glucose and fructose from hydrolysate of sucrose?
The sugar found in milk is ______.
