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Monosaccharides have -CHO (or C=O) and -...

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

A

D-glucose

B

D-Fructose

C

L-glucose

D

L-fructose

Text Solution

Verified by Experts

The correct Answer is:
B
Compound A is Fructose
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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 B and C, respectively are

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AAKASH SERIES-CARBOHYDRATES-Practice Sheet-5
  1. The correct chair form of given Haworth Structure will be

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  2. The product of the reaction D-Glyceraldehyde underset(HCl)overset(Me(2...

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  3. Which relationship (s)is/are true

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  4. Which of the following monosaccharides yields an optically active aldi...

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  5. Observe the following reaction and mark the correct statements(s)given...

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  6. Which of the following statements are correct

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  7. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  8. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  9. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  10. What is true about compound (I)

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  11. Compound (II) is/has

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  12. Assuming that polymerisation of (I) takes place in the manner similar ...

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  13. Match the following columns

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  14. Match the following columns

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  15. How many acetal groups in the following

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  16. How many of following compound can form an acyclic (non-cyclic) struct...

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  17. How many alpha-glycosidic link (s) are present in the given Oligosacch...

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  18. What is the maximum value of (x)

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  19. How many of the following are correctly matched (I) Sucrose- (C(1) -...

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  20. How many of the following pairs can form same osazone (a) D-Glucose ...

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