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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

Racemisation

C

Anomerisation

D

Mutarotation

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The correct Answer is:
D
The `beta` and `alpha` – glucose have different rotations. When either is dissolved in water, their rotation changes until the same fixed values results. This is called mutarotation.
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The specific rotation, [alpha] , is expressed as

Do the anomers of alpha -D-glucose have specific rotations of the same magnitude but opposite signs?

alpha- and beta- Glucose differ in the orientation of the (-OH) group around:

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. For mannose the mutarotation can be shown in brief as follow:

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

Knowledge Check

  • The beta and alpha glucose have different specific rotations. When either is dissolved in water, their rotation changes until the same fixed value results. This is called

    A
    Epimerisation
    B
    Racemisation
    C
    Anomerisation
    D
    Mutarotation

  • The beta and alpha glucose have different specific rotations. When either is dissolved in water , their rotation changes until the same fixed value results. This is called

    A
    epimerization
    B
    racemisation
    C
    anomerisation
    D
    mutarotation

  • The specific rotation, [alpha] , is expressed as

    A
    `(alpha_(obs))/(l.c)`
    B
    `alpha_(obs)lc`
    C
    `(l.c)/(alpha_(obs))`
    D
    `(alpha_(obs))/(l.c^(2))`
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