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प्रश्न
What are the expected products of hydrolysis of lactose?
What are the hydrolysis products of lactose?
What are the products formed upon hydrolysis of lactose?
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उत्तर १
Lactose is composed of β-D galactose and β-D glucose. On hydrolysis, it gives two molecules of lactose monosaccharide, i.e., one molecule each of D-(+)-glucose and D-(+)-galactose.
\[\ce{\underset{Lactose}{C12H22O11} + H2O ->[H3O+][or Lactose] \underset{D-(+)-glucose}{C6H12O6} + \underset{D-(+)-galactose}{C6H12O6}}\]
उत्तर २
When lactose (C12H22O11) undergoes hydrolysis, it yields glucose (C6H12O6) and galactose (C6H12O6).
Notes
Students can refer to the solution based on the marks given in the paper.
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संबंधित प्रश्न
Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain.
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\[\begin{array}{cc}
\ce{CHO}\phantom{..}\\
|\phantom{......}\\
\ce{(CHOH)4}\\
|\phantom{......}\\
\ce{CH2OH}
\end{array}\]
Which of the following gives a positive Fehling solution test?
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Which of the following monosaccharide is pentose?
Monosaccharides usually contains ____________ carbon atoms.
The pair of compounds in which both the compounds give the positive test with Tollen’s reagent is:
Structure of a disaccharide formed by glucose and fructose is given below. Identify anomeric carbon atoms in monosaccharide units.
Which of the following monosaccharides are present as five membered cyclic structure (furanose structure)?
(i) Ribose
(ii) Glucose
(iii) Fructose
(iv) Galactose
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Assertion: Deoxyribose, \[\ce{C5H10O4}\] is not a carbohydrate.
Reason: Carbohydrates are hydrates of carbon so compounds which follow \[\ce{C_x(H2O)_y}\] formula are carbohydrates.
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Glucose is a reducing sugar
Reagent X is:
The following questions are case-based questions. Read the passage carefully and answer the questions that follow:
| Carbohydrates are optically active polyhydroxy aldehydes and ketones. They are also called saccharides. All those carbohydrates which reduce Fehling's solution and Tollen's reagent are referred to as reducing sugars. Glucose, the most important source of energy for mammals, is obtained by the hydrolysis of starch. Vitamins are accessory food factors required in the diet. Proteins are the polymers of α-amino acids and perform various structural and dynamic functions in the organisms. Deficiency of vitamins leads to many diseases. |
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(a) The penta-acetate of glucose does not react with Hydroxylamine. What does it indicate? (1)
(b) Why cannot vitamin C be stored in our body? (1)
(c) Define the following as related to proteins: (2)
- Peptide linkage
- Denaturation
OR
(c) Define the following as related to carbohydrates: (2)
- Anomers
- Glycosidic linkage
