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What is mutarotation?...

What is mutarotation?

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The phenomenon involving the change in the specific rotation of sugar with time, till it attains a constant value is called mutarotation.
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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: