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Monosaccharides

D-glucose is ...

Question

D-glucose is converted into osazone. The number of equivalents of phenyl hydrazine required by one equivalent of D-glucose in this reaction, is:

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is C 3
One equivalent of D-glucose requires 3 equivalents of phenyl hydrazine.
Two of them are added to the glucose molecule and one of them is added to Hydrogen.

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Q. For the complex conversion of D-glucose into the corresponding osazone, the minimum number of equivalent of phenyl hydrazine required is:

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Q. Assertion :When the ketohexose, D() fructose is treated with phenyl hydrazine it produces an osazone that is identical with the one prepared from either D-(+) glucose or D-(+) mannose. Reason: Sugars forming same osazone have different configuration

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