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D-tagatose is a 2-ketohexose which forms...

D-tagatose is a 2-ketohexose which forms same osazone as D-galactose. What is the structure of D-tagatose

A

B

C

D

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The correct Answer is:
C
Since D-tagatose (a keto hexose) and D-galactose form the same osazone, they have same configuration at `C-3, C-4, C-5 and C-6`
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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

Find structure of compound D :

Find structure of compound D :

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

  • Draw the structure of beta-D-(-) fructfuranose is

    A
    B
    C
    D

  • Regarding lactose some statements are given below A) On hydrolysis lactose gives beta-D- galactose and beta-D - glucose B) In lactose C_(1) of beta-D- galactose has acetal structure and C_(1) of beta- D - glucose has hemiacetal structure C) In lactose molecule beta-D - galactose is a nonreducing unit and beta-D - glucose is a reducing unit The correct statements are

    A
    A, C
    B
    A, B
    C
    B, C
    D
    A, B, C

  • 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

    A
    only compound
    B
    two compounds
    C
    three compounds
    D
    four compounds
    • AAKASH SERIES-CARBOHYDRATES-Practice Sheet-5
    1. D-tagatose is a 2-ketohexose which forms same osazone as D-galactose. ...

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    2. The correct chair form structures of beta- galactose will be

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    3. Killiani-Fischer synthesis of D (+) Arabinose gives

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    4. An optically active compound A gave an [alpha](0)^(25) = 30^(@) while ...

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    5. Although D-galactose rotates plane polarized light its oxidation produ...

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    6. underset(underset(CH(2)OH)(|))overset(overset(overset(overset(CHO)(|))...

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    7. Find the average molecular mass of starch given that an aqueous soluti...

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    8. Which of the following orders of sweetness is correct

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    9. In the multi step conversion of an Aldose in to next higher Aldose by ...

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    10. The Fischer projection formula shown above is the enolic form of

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    11. The correct chair form of given Haworth Structure will be

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

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    13. Which relationship (s)is/are true

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

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

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    16. Which of the following statements are correct

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

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

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

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    20. What is true about compound (I)

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