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The beta (beta) and alpha (alpha) glucos...

The beta (`beta`) and alpha (`alpha`) glucose have different specific rotation. When either is dissolved in water, their specific rotation changed to reach a certain fixed value. This is called :-

A

epimerisation

B

reacemisation

C

anomerisation

D

mutarotation

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The correct Answer is:
D
The `beta` and `alpha`- glucose have dihfferent rotations. When eithers is disolved in water, their rotation changes until the same fixed value resutls. This is called mutarotion .
`alpha`-D-glucose
Specific rotation =`+110^@ hArr`
Open chain form of equilibrium mixture
Specific rotation = `+52.3^2 hArr beta-D `- glucose
Specific rotation `= + 19.2^@`
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D(+) Glucose has melting point 146^(@)C and specific rotation [alpha]_(C)6(25) is + 122^(@)C . Another D(+) Glucose has melting 150^(@) C and specific rotation [alpha]_(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 decrease 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. What percentage of beta -D-(+) glucopyrnsone found at equillibrium in the aqueous solution?

D(+) Glucose has melting point 146^(@)C and specific rotation [alpha]_(C)6(25) is + 122^(@)C . Another D(+) Glucose has melting 150^(@) C and specific rotation [alpha]_(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 decrease 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. Mutarotation is characteristic feature of

D(+) Glucose has melting point 146^(@)C and specific rotation [alpha]_(C)6(25) is + 122^(@)C . Another D(+) Glucose has melting 150^(@) C and specific rotation [alpha]_(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 decrease 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. For mannose the mutarotation can be shown in brief as follow:

NARAYNA-BIOMOLECULES-EXERCISE-3
  1. Which of the following does not exist as a Zwitter ion ?

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  2. Proteins can be denatured by

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  3. The beta (beta) and alpha (alpha) glucose have different specific rota...

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  4. Which of the following is incorrect ?

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  5. Assertion- Diusruption of the natural structure of a protein is called...

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  6. In DNA, the complementary bases are :

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  7. Which of the following is not present in a nucleotide ?

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  8. Preteins when heated with conc. NHO3 give a yellow colour. This is

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  9. In the following strcuture anomeric carbon is

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  10. A diabetic person carries a packet of glucose with him always because

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  11. The segment of DNA which acts as the instrumental manual for the synth...

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  12. The base found only in nucleotide of RNA, is

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  13. The transfer RNA anticodon for the messenger RNA codon G-C-A is

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  14. The pK(a1) and pK(a2) of an amino acid are 2.3 and 9.7 respectively. T...

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  15. Which one of the following does not exhibit the phenomenon of mutarota...

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  16. Hydrolysis of sucrose is called

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  17. Glucose + Tollen's reagent to Silver mirror the above process shows

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  18. Which one of the following statements is not true regarding ( +) Lacto...

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  19. What is nature of glucose -glucose linkage in starch that makes its so...

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  20. Which is not the correct statement about RNA and DNA?

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