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प्रश्न
Give two evidences for presence of formyl group in glucose.
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उत्तर
- Glucose gets oxidized to a six-carbon monocarboxylic acid called gluconic acid on reaction with bromine water which is a mild oxidizing agent. Thus, the carbonyl group in glucose is in the form of formyl (–CHO).
- Hemiacetal group of glucopyranose structure is a potential aldehyde (formyl) group. It imparts reducing properties to glucose. Thus, glucose gives positive Tollen’s test or Fehling test.
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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.
Give scientific reasons:
Hydrolysis of sucrose is called inversion.
Draw a neat diagram for the following:
Haworth formula of glucopyranose.
Draw a neat diagram for the following:
Haworth formula of maltose
Glucose on oxidation with dilute nitric acid gives _______________
Draw the structure of α-D glucopyranose.
Write the name of the unit to which glucose unit is linked to from sucrose.
Explain the classification of carbohydrates with examples.
What is the action of the following reagents on glucose?
acetic anhydride
What is the action of the following reagents on glucose?
hydrogen iodide
Write a chemical reaction to convert glucose into glucose cyanohydrin.
Write a commercial method for preparation of glucose.
Identify the bond that links the carbon of two adjacent monosaccharides.
Formation of lactose by conden ation results in the release of how many molecules of water?
From the following which is a heteropolysaccharide?
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Identify the WRONG statement.
By which of the following feature we can identify the relatively small DNA molecules of plasmids?
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 |
From the following identify the two types of glucose polymers present in starch.
Identify the CORRECT combination.
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
One mole of a carbohydrate on hydrolysis gives one mole of glucose and one mole of galactose. Identify the carbohydrate.
Which element among the following is not present in saccharine?
Which one of the following is an oligosaccharide?
Which one of the following is Tetrose sugar?
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What is the product obtained when Br2 water reacts with glucose?
When one mole of lactose is hydrolysed, the hydrolysate contains ____________.
Which one given below is a non-reducing sugar?
\[\ce{Glucose ->[(HCN)] Product ->[(hydrolysis)] Product ->[(HI + Heat)] A}\], the compound A is:
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Fructose
Write the structure of α-D (+) glucopyranose.
If 'n' represents total number of asymmetric carbon atoms in a compound, then the possible· number of optical isomers of the compound is ______.
Lactose is made of ______.
The two monosaccharides in a disaccharide are held together by ______ bonds.
Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?
Which one is a non-reducing commercial sugar?
The glycosidic linkage present in maltose is ______.
Why carbohydrates are generally optically active.
Assign D/L configuration to the following monosaccharides:
Describe the action of the following reagent on glucose:
Bromine water
Describe the action of the following reagent on glucose:
dil. Nitric acid.
Explain the hydrolysis of sucrose.
Write the ring structure of glucose.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
The linkage present in Lactose is ______.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Write the Zwitter ion structure of alanine.
