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(A) Reducing sugars undergo mutarotion. ...

(A) Reducing sugars undergo mutarotion.
(R) During mutarotation, one pure anomer is converted into an equilibrium mixture of two anomers

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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The optical rotation of the alpha form of a pyranose is + 150.70, that of the beta form is +52.80. In solution an equlibrium mixture of the anomers has an optical rotation of +80.20. The percentage of the alpha form at equilibrium is

Specific rotation for alpha -anomer of a given mono saccharide is 100^(@) and for beta -anomer is +20^(@) , specific rotation of equilibrium mixture is 68^(@) , if % of alpha anomer is x xx 10% then 'x' 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 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 alpha- glucose and beta- glucose differ in configuration at ______ and are called

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?

(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) Sucrose is reducing sugar where as maltose is non-reducing sugar. (R) In disaccharides the reducing property does not depend upon the position of linkage between two monosaccharide units.

D(+) Glucose has melting point 140^(@)C and specific rotation [a]_(D)^(25) is 112^(@)C . Another D(+) Glucose has melting point 150^(@)C and specific rotation [a]_(D)^(25) is +18.7^(@)C . The two form have significantly different optical rotation but when an aqueous solution of either form is allowed to stand, it rotation changes. The specific rotation of one form decreases and rotation of other increases until both solution show the same value +52.7^(@) . The change in rotation towards an equilibrium value is called mutarotation [alpha]_(D)^(25) = +18.7^(@)C " " [alpha]_(D)^(25) = +112^(@)C Mutarotation is characteristic feature of

D(+) Glucose has melting point 140^(@)C and specific rotation [a]_(D)^(25) is 112^(@)C . Another D(+) Glucose has melting point 150^(@)C and specific rotation [a]_(D)^(25) is +18.7^(@)C . The two form have significantly different optical rotation but when an aqueous solution of either form is allowed to stand, it rotation changes. The specific rotation of one form decreases and rotation of other increases until both solution show the same value +52.7^(@) . The change in rotation towards an equilibrium value is called mutarotation [alpha]_(D)^(25) = +18.7^(@)C " " [alpha]_(D)^(25) = +112^(@)C For mannose the mutarotation can be shown in brief as follow

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) Hydrolysis of sucrose is called inversion of cane sugar. (R) Sucr...

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  2. (A) In a sucrose molecule, glucose is present in the furanose form and...

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  3. (A) Reducing sugars undergo mutarotion. (R) During mutarotation, one...

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  4. (A) Galactose is the C4 epimer of glucose. (R) Glucose and galacto...

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  5. (A) Sucrose is an example of reducing sugar. (R) Sucrose gives silve...

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  6. (A) Two different hexoses may give the same osazone. (R) Different H...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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