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Specific rotation of α and β -D-glucose.

A freshly prepared solution of α-D-glucose shows a specific rotation of +112∘. Over time, the rotation of this solution decreases and reaches an equilibrium value of +52.5∘. In contrast, a freshly prepared solution of β-D-glucose has a specific rotation of +19∘. The rotation of this solution increases over time to the same equilibrium value of +52.5∘.

(a) Why do specific rotations of the freshly prepared samples change over time, and why do they reach the same equilibrium value?

(b) Compute the percentage of each anomer at equilibrium.

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  • Category:- Chemistry
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