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All sugars give a positive Molisch's test because they contain hydroxyl (–OH) groups that can react with α-naphthol in the presence of sulfuric acid. This reaction leads to the formation of a purple-colored complex, indicating the presence of carbohydrates. Both monosaccharides and disaccharides, which are classified as carbohydrates, can participate in this reaction, resulting in a positive test. Thus, the test serves as a general indicator for the presence of sugars.
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After hydrolysis did sucrose give a positive test with fehlings test why orwhy not?
Sucrose would not give a positive test with Fehling's reagent after hydrolysis because sucrose is a non-reducing sugar. During hydrolysis, sucrose is broken down into its monosaccharide components (glucose and fructose), which are reducing sugars and can react with Fehling's reagent to give a positive test for reducing sugars.
Why does glycoproteins reacts positively with Molisch reagent?
Glycoproteins give positive results for Molisch's test. This answer is true because Molisch test was a test for sugar.
What group of substance that give positive reaction to molisch test?
Carbohydrates typically give a positive reaction to the Molisch test. This is because the Molisch reagent reacts with the carbohydrates to form a purple complex, indicating the presence of sugar molecules in the solution.
Did gelatin give positive result with xanthoprotic test?
yes,it give positive test
Will sugar alcohol test positive for alcohol on a drug screen test?
No
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.
Why is Omnicef rarely prescribed to diabetics?
The antibiotic Omnicef can give a false positive for sugar in a urine test, this could cause a complication in treating diabetes.
Which halogens give a positive beilstein test?
Chlorine, bromine, and iodine give a positive Beilstein test. The test involves ignition of a compound in the presence of copper oxide, which forms a green flame due to the halogen present in the compound.
Do eggs test positive in benedicts test?
Yes, eggs can test positive in the Benedict's test because they contain glucose, which is a reducing sugar that reacts with the reagent in the test to form a colored precipitate.
Will benadryl give you a false positive breathalizer?
I have to do weekly breathalyzer test will Benadryl make me test positive
Does formalin give positive Fehling's solution test?
Formalin gives a positive Fehling's solution test.
Does starch gives positive result for Benedict test?
Starch is made up of repeating glucose units. Though it is a non reducing sugar, its hydrolysis gives out pure glucose, which is known as dextrose. And glucose, as we know, is a reducing sugar and hence would give a positive result in Benedict's test.
