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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 & R are true and R is the correct explanation of A

B

Both A & R are true, but R is not the correct explanation of A

C

A is true, R is false

D

A is false, R is true

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The correct Answer is:
A
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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 - 1
  1. (A) Cellulose is not digested by human beings. (R) Human beings are ...

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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): Lactose on hydrolysis gives glucose and gallactose. (R): Lactos...

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  7. (A) Cellulose is not digested by human beings. (R) Human beings are ...

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  8. The peptide linkage is

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  9. Which of the following contains nitrogen ?

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  10. The building unit of all proteins are

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  11. Number of peptide linkages in the artificial sweetner ''aspartame'' is

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  12. The structural feature which distinguishes proline from alpha - amino ...

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  13. Which of the following amino acids possesses a non polar side chain

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  14. Which of the following amino acids contains a thiol group in the side ...

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  15. The amino acid which contain a hydroxy group in the side chain

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  16. Essential amino acid among the following is

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  17. The number of amino acids found in proteins that a human body can synt...

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  18. Which one of the following is not an essential anino acid?

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  19. Among the following the basic amino acid is

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  20. Which of the following statement is not correct ?

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