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Which of the following pairs give positive toollens test-hexanal,acetophenone and fructose,sucrose?
The simple sugars will not react with the test because they are not aldehydes.
Why sucrose does not give a positive Benedict's test but hydrolyzed sucrose does give a positive beneditcts test?
Sucrose is formed from glucose and fructose.Sucrose is formed from glucose and fructose. Glucose and fructose gives positive test for benedict becuz both of them are reducing sugars whereas sucrose is not a reducing sugar so it gives negative test for benedict. On prolonged heating,sucrose will form glucose and fructose (reducing sugars)which ultimately gives a positive result .
What group of carbohydrates react positively in Seliwanoff's test?
Sugars, the test distinguishes between aldose and ketose sugars; the test shows positive for ketose sugars.
Will hydrolysed dextrine give positive response to Benedict test?
Yes, it should. Benedicts test will be positive for reducing sugars, and since glucose is such a sugar, and would be a product of dextrin hydrolysis, you should get a positive result with Benedicts reagent.
Which compound gives positive Fehlings test?
Fehling test is used for reducing sugars.
Which halogens give a positive beilstein test?
which halogens give a positive beilstein test?
Did gelatin give positive result with xanthoprotic test?
yes,it give positive test
Why ripe bananas mostly test negative for starch and positive for sugars?
During the ripening process, the complex carbohydrates in bananas have converted to sugars.
After hydrolysis did sucrose give a positive test with fehlings test why orwhy not?
After hydrolysis sucrose did give a positive test. It reduces sugar that has hemiketal and hemiaetal in it.
What color indicate positive mannitol test?
Yellow, which means bacteria is able to produce acids from mannitol fermentation
Does phenol give a positive biuret test?
No. The Biuret test only gives a positive result if a peptide bond exists. Phenol doesn't have a peptide bond, so it will not give a positive test.
Does formalin give positive Fehling's solution test?
Formalin gives a positive Fehling's solution test.
