BIOLOGY
CLASSIFICATION OF CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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orange
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blue
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no changes in color
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red
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Detailed explanation-1: -Aldose sugars react with the Seliwanoff’s reagent to give faint pink color which intensifies with time.
Detailed explanation-2: -It is named after Theodor Seliwanoff, the chemist who devised the test. When added to a solution containing ketoses, a red color is formed rapidly indicating a positive test.
Detailed explanation-3: -Lactose and also maltose hydrolyzes upon prolonged heating and gives positive result with Seliwanoff’s reagent.
Detailed explanation-4: -The formation of the cherry red-colored complex indicates a positive result which means that the given sample contains ketoses. The absence of such color or the appearance of the color after a prolonged period of time indicates a negative result which means that the test sample doesn’t have ketoses.