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Question

On heating glucose with Fehling's solution, we get a precipitate whose colour is _______.

A
Yellow
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B
Red
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C
Black
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D
White
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Solution

The correct option is B Red
On heating glucose with Fehling's solution, the presence of aldehyde functional group reduces the deep blue solution of copper (II) to a red precipitate of insoluble copper oxide. The test is commonly used for reducing sugars.
Glucose + Fehling solution ® Gluconic acid + Cu2O (red ppt)

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