BIOLOGY
CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This test will give positive result for ketohexoses.
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Barfoed Test
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Osazone formation
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Seliwanoff’s test
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Bial’s Orcinol test
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Explanation:
Detailed explanation-1: -Seliwanoff’s test is used to differentiate between sugars that have a ketone group (ketose) and sugars that have an aldehyde group (aldoses). This test is a timed color reaction specific to ketohexoses.
Detailed explanation-2: -Fructose and sucrose are two common sugars which give a positive test. Sucrose gives a positive test as it is a disaccharide consisting of fructose and glucose.
Detailed explanation-3: -Result Interpretation of Seliwanoff’s test: Positive seliwanoff’s test: Fructose and sucrose. Negative seliwanoff’s test: glucose, distilled water.
Detailed explanation-4: -Lactose and also maltose hydrolyzes upon prolonged heating and gives positive result with Seliwanoff’s reagent.
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