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A student ran an analysis on an unknown carbohydrate. The results indicated a positive test for...

A student ran an analysis on an unknown carbohydrate. The results indicated a positive test for both Benedict's and Seliwanoff's tests and hegative for the iodine test. Does the sugar contain an aldehyde or ketone? If so, which one?

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Answer #1

The results indicated a positive test for both Benedict's and Seliwanoff's tests for ketones.

Benedicts reagent is used to detection of reducing sugars. In a benedicts test a chemical reagent is prepared from sodium carbonate, sodium citrate and copper sulphate. A positive test with benedicts is indicate by colour change blue to red . When testing for the presence of reducting sugars like glucose, fructose, molatose.

Seliwanoff's tests is used to differentiate aldehyde and ketone. ketone imidiately give positive test Seliwanoff's.

Iodine test give for polysaccharide.It is negaive for monosaccharides.

So suger contains Ketone. >>>>> answer

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