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Sugars are characterized by the preparat...

Sugars are characterized by the preparation of Osazone derivatives. Which sugars have identical osazones

A

glucose and fructose

B

Glucose and Arabinose

C

Glucose and Lactose

D

Glucose and maltose

Text Solution

Verified by Experts

The correct Answer is:
A
Glucose and fructose are formed identical osazones, because in the formation osazone involves only the first two carbon atoms the configuration around the remaining four carbon atoms `[C_(3), C_(4), C_(5), C_(6)]` identical in both
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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

Knowledge Check

  • Sugar are characterised by the preparation of osazone derivatives. Which sugar have identical osazones?

    A
    Glucose and lactose
    B
    Glucose and fructose
    C
    Glucose and arabinose
    D
    Glucose and maltose

  • Which sugar is present in frutis?

    A
    Fructose
    B
    Glucose
    C
    Sucrose
    D
    Galactose

  • The reagent which forms crystalline osazone derivatives with glucose is

    A
    Fehling solution
    B
    Phenyl hydrazine
    C
    Benedict's solution
    D
    Hydroxylamine
    • AAKASH SERIES-CARBOHYDRATES-Practice Sheet-4
    1. Sugars are characterized by the preparation of Osazone derivatives. Wh...

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    2. Which set of terms correctly identifies the carbohydrate shown ? ...

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    3. Which is true about the acidic character of hydroxyl groups of sugar a...

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    4. When an aqueous solution of D-glucose is treated with a base, it is co...

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    5. When alpha-D glucose is dissolved in water it undergoes a partial conv...

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    6. The number of chiral carbons are present in cyclic form of Allose and ...

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    7. Which of the following structures represent alpha-D- glucopyranose

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    8. A sample of water containing some dissolved table sugar and common sal...

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    9. Glucose reacts with PCl(5) product is

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    10. Reduction of hexose A (Molecular formula C(6)H(12)O(6)) with sodium bo...

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    11. The following carbohydrate is

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    12. Which of the following statements are correct

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    13. Similarities between D(+) Glucose and D(-) Fructose : correct statemen...

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    14. Glucose does not react with

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    15. Consider the following statements, correct statements

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    16. The number of correct statements are

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    17. Which two of the following aldohexoses give the same osazone derivativ...

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    18. D underset((A))("Glucopyranose") underset("dry HCl")overset(MeOH)rarr ...

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    19. D underset((A))("Glucopyranose") underset("dry HCl")overset(MeOH)rarr ...

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    20. D underset((A))("Glucopyranose") underset("dry HCl")overset(MeOH)rarr ...

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