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Monosaccharides and disaccharides in whi...

Monosaccharides and disaccharides in which aldehyde group is free reduce Tollen's reagent as well as Fehling solution and hence are known as reducing sugars. Carbohydrates react with excess of phcayl kydrazine to yield their crystalline derivatives called oxazones. In osazone formation only the first two carbon atoms are irrelved Osazone on hydrolysis gives same which are reduction with `ZnCH_(3)COOH` gives a ketose sugar
The same osazone is formed by

A

Glucose, galactose, mannose

B

Glucose, mannose, fructose

C

Maltose, surcrose, lactose

D

Starch, cellulose, glycogen

Text Solution

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The correct Answer is:
B
Glucose, mannose, fructose differ only C- 1 and C-2 and have some configuration at `C-3, C-4 C- 5 and C-6`. So they form the same osazone
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Monosaccharides and disaccharides in which aldehyde group is free reduce Tollen's reagent as well as Fehling solution and hence are known as reducing sugars. Carbohydrates react with excess of phcayl kydrazine to yield their crystalline derivatives called oxazones. In osazone formation only the first two carbon atoms are irrelved Osazone on hydrolysis gives same which are reduction with ZnCH_(3)COOH gives a ketose sugar Osazone cannot be formed by whihc of the following

Monosaccharides and disaccharides in which aldehyde group is free reduce Tollen's reagent as well as Fehling solution and hence are known as reducing sugars. Carbohydrates react with excess of phcayl kydrazine to yield their crystalline derivatives called oxazones. In osazone formation only the first two carbon atoms are irrelved Osazone on hydrolysis gives same which are reduction with ZnCH_(3)COOH gives a ketose sugar The end product 'Z' in the following sequence of reactions. Glucose, underset(("excess"))overset(Ph. NH.NH_(2))rarr X underset(Delta)overset(H_(2)O//H^(+))rarr Y overset(Zn//AcOH)rarrZ

Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usual oxidation and reduction. Further, monosaccharides from osazone when treated with excess of phenylhdrazine (3 equivalents). In osazone formation only the first two carbon atoms are involved. Thus monosaccharidxes having identical configuration on reset of C atoms except first two will form same osazone, as is the case with glucose and fructose. A, B and C are three hexoses and form same osazone D. Compounds A to D behave as below (A) D overset(HCl)rarr underset(CH_(3)COOH)overset(Zn)rarr D - Fructose (B) A overset(Ni.H_(2))rarr overset(HNO_(3))rarr underset(H_(3)O^(+))overset(Na-Hg)rarr B + C (C ) B overset(HNO_(3))rarr Optically active glycaric acid (D) C overset(HNO_(3))rarr Optically inactive glycaric acid Compound D is an osazone which can be obtained from

Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usual oxidation and reduction. Further, monosaccharides from osazone when treated with excess of phenylhdrazine (3 equivalents). In osazone formation only the first two carbon atoms are involved. Thus monosaccharidxes having identical configuration on reset of C atoms except first two will form same osazone, as is the case with glucose and fructose. A, B and C are three hexoses and form same osazone D. Compounds A to D behave as below (A) D overset(HCl)rarr underset(CH_(3)COOH)overset(Zn)rarr D - Fructose (B) A overset(Ni.H_(2))rarr overset(HNO_(3))rarr underset(H_(3)O^(+))overset(Na-Hg)rarr B + C (C ) B overset(HNO_(3))rarr Optically active glycaric acid (D) C overset(HNO_(3))rarr Optically inactive glycaric acid Compound A should be

Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usual oxidation and reduction. Further, monosaccharides from osazone when treated with excess of phenylhdrazine (3 equivalents). In osazone formation only the first two carbon atoms are involved. Thus monosaccharidxes having identical configuration on reset of C atoms except first two will form same osazone, as is the case with glucose and fructose. A, B and C are three hexoses and form same osazone D. Compounds A to D behave as below (A) D overset(HCl)rarr underset(CH_(3)COOH)overset(Zn)rarr D - Fructose (B) A overset(Ni.H_(2))rarr overset(HNO_(3))rarr underset(H_(3)O^(+))overset(Na-Hg)rarr B + C (C ) B overset(HNO_(3))rarr Optically active glycaric acid (D) C overset(HNO_(3))rarr Optically inactive glycaric acid Compound B and C, respectively are

Carbonyl compounds give different oxidation products with different reagents .Several oxidising agents can be used to oxidise carbonyy compounds .Ammonical silver nitate (tollens reagent ) oxidises aliphatic as well as aromatic aldehydes . R-CHO overset("Tollens reagents ") to R-COOh +Ag (silver mirror ) strong oxidatising agents like KMnO_4 //H^+ ,HNO_3 ,K_2 Cr_2 O_7 //H^+ oxidise Aldehydes as well as ketons . open chain ketons in oxidation give mixture of two carbonylic acids . oxidation as well as ketons of unsymmetrical ketons takes place according to popoff's rule .According to this rule alpha - carbon whose bond breaks in oxidation always belongs to the alkyl group which has more number of carbons the reagent which oxidise only aliphatic ketone is :

AAKASH SERIES-CARBOHYDRATES-Practice Sheet-1
  1. Which of the following statements is correct?

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  2. Which of the following reagents is useful to distinguish between gluco...

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  3. Which of the following is correct statement?

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  4. Which of the following statement is/are correct?

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  5. What is /are the major product (s) in the reaction below?

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  6. Which of the following statements is/are correct

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  7. C(6)H(12)O(6) can be glucose or Fructose C(6)H(12)O(6) overset(HCN)rar...

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  8. C(6)H(12)O(6) can be glucose or Fructose C(6)H(12)O(6) overset(HCN)rar...

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  9. C(6)H(12)O(6) can be glucose or Fructose C(6)H(12)O(6) overset(HCN)rar...

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  10. Monosaccharides and disaccharides in which aldehyde group is free redu...

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  11. Monosaccharides and disaccharides in which aldehyde group is free redu...

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  12. Monosaccharides and disaccharides in which aldehyde group is free redu...

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  13. Match the following columns

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  14. Match the following columns

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  15. The minimum number of carbon atoms that should present in a carbohydra...

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  16. The number of chiral centers in the open chain structure of glucose is

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  17. How many chiral centers are present in the product obtained by reactio...

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  18. The no. of chiral carbon atoms present in ketopentose is

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  19. How many chiral carbon atoms are present in beta-D- ribose?

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  20. The number of chiral centers present in fructo furanose is

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