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(A) D-Glucose and D-Mannose form identic...

(A) D-Glucose and D-Mannose form identical osazone on reaction with excess of phenyl hydrazine
(R) D-Glucose and D-Mannose are epimers differing in configuration at C-2 only.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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The correct Answer is:
A
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D- glucose and L - glucose differ in

(A) Galactose is the C_4 epimer of glucose. (R) Glucose and galactose differ in configura- tion at C_4 .

How many of the following pairs can form same osazone (a) D-Glucose and D-Galactose (b) D-Glucose and D-mannose (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

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

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

How many moles of phenyl hydrazine molecules are required to form osazone by one mole of glucose?

Wrire the ring structure of D-glucose. What are their names ?

(A) alpha -D (+) Glucose and beta-D(+) - Glucose are enantiomers. (R) alpha-D(+) Glucose and beta-D(+) - Glucose are mirror images.

In which one of polysaccharide, D glucose units are joined same as in starch

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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  2. (A) Lactose is a reducing Sugar (R) Lactose if formed by glucosidic ...

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  3. (A) D-Glucose and D-Mannose form identical osazone on reaction with ex...

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  4. (A) Sucrose is reducing sugar where as maltose is non-reducing sugar. ...

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  5. (A) Glucose gives a reddish-brown ppt with Fehling's solution. (R) R...

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  6. (A) Sucrose is a non-reducing carbohydrate. (R) In sucrose both the ...

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  7. (A) Glycogen is known as animal starch. (R) The structure of glycoge...

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  8. (A) Acetic acid fit into Cx(H2O)y gneral formula of carbohydrates. ...

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  9. (A) Honey has been used for a long time as an instant source of energy...

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  10. (A) Starch gives blue colour with iodine. (R) Starch form complex wi...

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  11. (A) DNA stores all the hereditary information of a biological species....

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  12. (A) 2-deoxyribose is reducing sugar. (R) 2-deoxyribose is constituen...

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  13. (A) Guanine unites with Cytosine but not with Thymine. (R) Guanine a...

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  14. (A) Adenine pairs up with thymine but not with cytosine. (R) With cy...

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  15. (A) The pyrimidine base thymine is present in RNA. (R) DNA controls ...

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  16. (A) In double helical structure of DNA, cytosine pairs with guanine wi...

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  17. (A) Uracil occur in RNA. (R) RNA controls the synthesis of proteins.

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  18. (A) DNA finger printing is used in forensic labs. (R) Every individu...

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  19. (A) DNA is the chemical basis of heredity and may be regarded as the r...

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  20. (A) RNA on hydrolysis gives equal content of guanine, cytocine and als...

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