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Question
Account for the following:
Glucose is a reducing sugar
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Solution
Glucose reduces Fehlings reagent
\[\begin{array}{cc}
\phantom{..}\ce{H}\phantom{...}\ce{O}\phantom{.........................}\ce{HO}\phantom{...}\ce{O}\phantom{...............}\\
\phantom{..}\backslash\phantom{..}//\phantom{............................}\backslash\phantom{..}//\phantom{..............}\\
\phantom{.}\ce{C}\phantom{...............................}\ce{C}\phantom{..............}\\
\phantom{..}|\phantom{................................}|\phantom{...............}\\
\phantom{.}\ce{H-C-OH}\phantom{.......................}\ce{H-C-OH}\phantom{............}\\
\phantom{......}|\phantom{................................}|\phantom{...................}\\
\phantom{.}\ce{HO-C-H + 2Cu^{2+} + 2H2O -> HO-C-H + Cu2O + 4H+}\\
\phantom{.}|\phantom{................................}|\phantom{..............}\\
\phantom{..}\ce{H-C-OH}\phantom{......................}\ce{H-C-OH}\phantom{.............}\\
\phantom{..}|\phantom{................................}|\phantom{...............}\\
\phantom{..}\ce{H-C-OH}\phantom{......................}\ce{H-C-OH}\phantom{.............}\\
\phantom{..}|\phantom{................................}|\phantom{...............}\\
\phantom{......}\ce{CH2OH}\phantom{.........................}\ce{CH2OH}\phantom{.............}
\end{array}\]
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RELATED QUESTIONS
What are the expected products of hydrolysis of lactose?
What are reducing sugars?
The following molecule is called as:
\[\begin{array}{cc}
\ce{CHO}\phantom{..}\\
|\phantom{......}\\
\ce{(CHOH)4}\\
|\phantom{......}\\
\ce{CH2OH}
\end{array}\]
The two functional groups present in a typical carbohydrate are:
Monosaccharides usually contains ____________ carbon atoms.
Reducing sugars reduce ____________.
Three cyclic structures of monosaccharides are given below which of these are anomers.
| (I) |  |
| (II) |  |
| (III) |  |
Which of the following monosaccharides are present as five membered cyclic structure (furanose structure)?
(i) Ribose
(ii) Glucose
(iii) Fructose
(iv) Galactose
Monosaccharides contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?
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. |
Answer the following:
(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
