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Question

The optical rotation of the α form of a pyranose is +150.7, that of the β form is +52.8. In solution an equilibrium mixture of the anomers has an optical rotation of +80.2. The percentage of the α form at
equilibrium is

A
28%
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B
32%
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C
68%
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D
72%
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Solution

The correct option is A 28%
x(150.7)+(100x)(52.8)=100×80.2x=28%

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