Report Sheet Q.10 What carbohydratels) would have the following test results? a.
ID: 1046343 • Letter: R
Question
Report Sheet Q.10 What carbohydratels) would have the following test results? a. Produces a reddish-orange solid with Benedict's and a red color with Seliwanoff's u reagent in 1 minute Gives a color change with Benedict's test, a light orange color with Seliwanoff's reagent after 5 minutes, and produces no bubbles during fermentation b. c. Gives no color change with Benedict's or Seliwanoff"'s test, but turns a blue-black color with iodine reagent H. Hydrolysis of Disaccharides and Polysaccharides Results Sucrose + H2O Sucrose +HCI Starch +HO Starch+ HCI lodine test Benedict's test Hydrolysis products present Questions and Problems Q.11 How do the results of the Benedict's test indicate that hydrolysis of sucrose and starch occurred? Q.12 How do the results of the iodine test indicate that hydrolysis of starch occurred?Explanation / Answer
a) A ketose would be oxidiized to aldose in presence of a benedicts and gives a reddish orange color and it gives a red color in Seliwanoffs test. So it is a Ketose
b)An aldose because aldoses take longer time to react with Seliwanoff's reagent and they give light orange color.
c) Starch because it cannot be oxidized in benedicts solution and hence no color change/reaction. It gives blue black color withIodine as a result of a complex formation