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(A) Cane sugar undergoes inversion in aq...

(A) Cane sugar undergoes inversion in aqueous solution.
(R) Cane sugar hydrolyses in water to give two monosaccharides, in which degree of rotation is dominated by fructose than glucose.

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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Mutarotation is the change in specific rotation of an optically active compound in solution with time to an equilibrium value. Interconversion is possible only if sugar has anomeric hydroxyl group i.e., sugar is reducing. Diastereomers which differ in configuration of chiral carbon developed in hemiacetal formation are called anomers. Epimers are a pair of stereoisomers which differ in the configuration about one of its chiral carbon The anomeric carbon in fructose is

Mutarotation is the change in specific rotation of an optically active compound in solution with time to an equilibrium value. Interconversion is possible only if sugar has anomeric hydroxyl group i.e., sugar is reducing. Diastereomers which differ in configuration of chiral carbon developed in hemiacetal formation are called anomers. Epimers are a pair of stereoisomers which differ in the configuration about one of its chiral carbon On which carbon atom glucose and galactose differ in the position of -H and -OH groups?

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

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) Glucose and fructose give the same osazone. (R) Glucose and fruc...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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