Which of the following structures represents $\alpha - D$ -glucose ?
A
B
C
D
Medium
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A
a
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The optical rotation of the $\alpha$ - form of a pyranose is $+ 150.7^o$, that of the $\beta$ - form is $+ 52.8^o$. In solution an equilibrium mixture of these anomers has an optical rot ation of $+ 80.2^o$. The percentage of the $\alpha$ -form in equilibrium mixture is ....... $\%$