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What is mutarotation ?...

What is mutarotation ?

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The spontaneous change in specific rotation of an optically active compound in solution with time, to an equilibrium value, is called mutarotation.
The spontaneous change in specific rotation of an optically active compound in solution with time, to an equilibrium value, is called mutarotation.
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Explore conceptually related problems

Explain, in neutral or basic aqueous solution, glycosides do not show mutarotation, but in acidic medium they show mutarotation.

Assertion (A) D-glucose when dissolved in water undergo mutarotation while sucrose solution does not show mutarotation Reason (R) D-glucose exist in two cyclic anomeric forms.

Knowledge Check

  • Which of the following compounds will not show mutarotation ?

    A
    `alpha` -D (+) glucopyranose
    B
    `beta` -D (+) glucopyranose
    C
    Methly-`alpha`-D-glucopyranoside
    D
    `beta` - D(+) galacopyranose

  • Which sugar is dextrorotatory and indicates mutarotation ?

    A
    Sucrose
    B
    Maltose
    C
    Both (a) and (b)
    D
    None

  • Which of the following will not show mutarotation?

    A
    Maltose
    B
    Lactose
    C
    Glucose
    D
    Sucrose

    • Similar Questions

    Explore conceptually related problems

    A sugar exist in two isomeric form alpha-D & beta-D with specific rotation of 110^(@) and 30^(@) respectively. When alpha-D form of the suar is dissolved in water exhibits mutarotation till the equilibrium value of 90^(@) is attained. The equilibrium constant of mutarotation of beta-D form [Assuming only alpha and beta form in solution] is equal to:

    {:("Column (I)"," Column (II)"),("(a) Glucose","P. Reduces Tollen's reagent"),("(b) Fructose","Q. Exhibits mutarotation in mild alkaline medium"),("(c) Mannose","R. Produces tetraacetate derivative on treatment with anhydride and pyridine"),("(d) Glucopyranoside","S. Gets oxidised by"Br_(2)","H_(2)O):}

    An optically active drug has one chiral centre and only dextro rotatory isomer is effective. Moreover, it becomes ineffective when its optical activity is reduced to 35% of original. It was found that mutarotation of this drug was first order reaction with a rate constant of 1 xx 10^(-8) s^(-1) . Find the expiration time of the drug in years.

    (a)What is guttation? What is the cause of guttation? (b) What are hydathodes?

    The equilibrium constant for mutarotation alpha-"D Glucose "hArr beta-"D Glucose 1.8" . What percentage of alpha form remains at equilibrium?

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