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Q.
What percentage of $\beta-D-(+)$ glucopyranose is found at equilibrium in the aqueous solution?
Biomolecules
Solution:
Ordinary glucose is $\alpha$ -glucose, with a fresh aqueous solution having specific rotation, $[\alpha]_{D}=+111^{\circ} .$ On keeping the solution for sometime, $\alpha$ -glucose slowly changes into an equilibrium mixture of $\alpha$ -glucose $(36 \%)$ and $\beta-$ glucose $(64 \%)$ and the mixture has specific rotation $+52.5^{\circ} .$