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(A) Glucose and fructose give the same o...

(A) Glucose and fructose give the same osazone.
(R) Glucose and fructose have same configu- ration at `C_y, C_4 and C_5`

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

Text Solution

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The correct Answer is:
A
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Acetic acid and glucose have same

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

(A) Two different hexoses may give the same osazone. (R) Different Hexoses give same osazone if the first and second carbon atoms have same configuration.

(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) Fructose is the sweetest naturally occuring sugar. (R) Fructose is a functional isomer of glucose.

(A) In a sucrose molecule, glucose is present in the furanose form and fructose is present in the pyranose form. (R) Pyranose and furanose are homocyclic ring compounds.

(A) Hydrolysis of sucrose is called inversion of cane sugar. (R) Sucrose on hydrolysis gives laevo rotatory glucose and dextro rotatory fructose

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

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) alpha-D (+) Glucose and beta-D(+) - Glucose are enantiomers. (R)...

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  2. (A) Reduction of glucose with sodium borohydride gives sorbitol. (R)...

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  3. (A) Glucose and fructose give the same osazone. (R) Glucose and fruc...

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  4. (A): Fructose gives positive Tollen's test. (R) : Fructose is a Keto...

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  5. (A) Cane sugar undergoes inversion in aqueous solution. (R) Cane sug...

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  6. (A) C6 H(10) O5 is a carbohydrates. (R) Most of the carbohydrates ha...

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  7. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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

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

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

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

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

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

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

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

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

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

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

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

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

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