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The optical rotation of the prop- form o...

The optical rotation of the `prop`- form of a pyranose is +150.70, that of the `beta`-form is +52.80. In solution and equilibrium mixture of the anomers has an optical rotation of +80.20. The percentage of the `prop`- form at equilibrium is

A

`28%`

B

`32%`

C

`68%`

D

`72%`

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The correct Answer is:
A
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