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Freshly prepared alpha-D- glucose soluti...

Freshly prepared `alpha-D-` glucose solution has specific rotation `+111^(@)` and after sometime it becomes

A

`+52^(@)`

B

`+99^(@)`

C

`-92^(@)`

D

None

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The correct Answer is:
A
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Freshly prepared a-D-glucose solution has specific rotation +111^(@) and after sometime it becomes

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The specific rotation of a freshly prepared solution of alpha-D- Glucose changes from a value of x^(@) to a constant value of y^(@) . The values of x and y are respectively

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 What percentage of beta-D-(+) glucopyranose found at equilibrium in the aqueous solution?

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

Zinc dust in alcoholic solution is a specific reagent in the preparation of alkenes as a

AAKASH SERIES-CARBOHYDRATES-Practice Sheet-5
  1. Freshly prepared alpha-D- glucose solution has specific rotation +111^...

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  2. D-tagatose is a 2-ketohexose which forms same osazone as D-galactose. ...

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  3. The correct chair form structures of beta- galactose will be

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  4. Killiani-Fischer synthesis of D (+) Arabinose gives

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  5. An optically active compound A gave an [alpha](0)^(25) = 30^(@) while ...

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  6. Although D-galactose rotates plane polarized light its oxidation produ...

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  7. underset(underset(CH(2)OH)(|))overset(overset(overset(overset(CHO)(|))...

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  8. Find the average molecular mass of starch given that an aqueous soluti...

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  9. Which of the following orders of sweetness is correct

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  10. In the multi step conversion of an Aldose in to next higher Aldose by ...

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  11. The Fischer projection formula shown above is the enolic form of

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  12. The correct chair form of given Haworth Structure will be

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  13. The product of the reaction D-Glyceraldehyde underset(HCl)overset(Me(2...

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  14. Which relationship (s)is/are true

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  15. Which of the following monosaccharides yields an optically active aldi...

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  16. Observe the following reaction and mark the correct statements(s)given...

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  17. Which of the following statements are correct

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  18. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  19. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  20. Monosaccharides have -CHO (or C=O) and -OH groups, so they undergo usu...

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  21. What is true about compound (I)

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