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Question

Equimolar mixture of a αD(+)- glucose and βD(+)-glucose has specific rotation ([α]D) is:

A
92.4o
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B
+112.5o
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C
+52.5o
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D
19.2o
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Solution

The correct option is D +52.5o
The specific rotation of α-D-glucopyranose decreases from +112° to +52.5°.
The specific rotation of β-D-glucopyranose increases from +19° to +52.5°.
The specific rotation of equimolar mixture of α - D(+) - glucose and β - D(+) - glucose has a specific rotation 52.50.

Hence, the correct option is C.

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