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Why are sucrose and starch non-reactive to Benedict's reagent?

Best Answers

Because sucrose and statch are non-reducing in nature due to lack of free carbonyl group. read more

Benedict’s reagent reacts with the reducing end of a sugar, sucrose, as disaccharide of glucose and fructose are bonded such that there is no reducing ends to the sugar molecule so there is no reaction with benedict’s reagent. read more

Sucrose (household sugar) is a non-reducing sugar and thus does not react with Benedict's reagent. Benedict's reagent can be used to test for the presence of glucose in urine. Glucose found to be present in urine is an indication of diabetes. 5ml of Benedict's reagent is mixed with 0.5ml of urine and the mixture is put in a boiling water bath for 5 minutes. read more

Sucrose is thus a non-reducing sugar which does not react with Benedict's reagent. Sucrose still indirectly can produce a positive result with Benedict's reagent if heated with dilute hydrochloric acid(HCl) prior to the test. read more

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Image Answers

Food Testing for Sugar and Starch - ppt video online download
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Further Research

Benedict's Test for Reducing Sugars
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