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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.
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.
Will glucose give a positive fermentation test?
Yes, glucose typically gives a positive fermentation test. In microbiology, certain bacteria can ferment glucose, producing acids and gases as byproducts. This fermentation is often indicated by a change in pH or the production of gas in a fermentation tube. Therefore, glucose is commonly used as a substrate to assess the fermentation capabilities of various microorganisms.
Will albumin give positive result to Benedict test?
No, albumin will not give a positive result to the Benedict test. The Benedict test is used to detect the presence of reducing sugars such as glucose, fructose, and maltose, not proteins like albumin.
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.
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 a deoxy ribonucleic acid give a positive molisch test?
No, deoxyribonucleic acid (DNA) will not give a positive Molisch test. The Molisch test is a carbohydrate test that detects the presence of sugars, which are polysaccharides or monosaccharides. Since DNA is a nucleic acid composed of nucleotides, not carbohydrates, it does not react positively in this test.
Why do all sugar give a positive molisch's test?
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.
Does galactose give a positive test for thee Seliwanoff's test?
Galactose does not give a positive test for Seliwanoff's test. This test is used to differentiate between aldose and ketose sugars, with ketoses producing a rapid red color upon heating with the reagent. Since galactose is an aldose, it would not produce the characteristic reaction indicative of ketoses.
Which compound gives positive Fehlings test?
Fehling test is used for reducing sugars.
Is glucose expected to have a positive iodine test?
Yes, glucose is expected to give a positive iodine test. Iodine reacts with glucose to form a blue-black color, indicating the presence of reducing sugars in the sample.
Do lemon juice give fehling test?
Lemon juice does not give a positive Fehling's test because it primarily contains citric acid and other organic compounds, but not reducing sugars like glucose or fructose. The Fehling's test is used to detect the presence of reducing sugars, which can reduce copper(II) ions to copper(I) oxide, resulting in a color change. Since lemon juice lacks significant amounts of reducing sugars, it will not produce the characteristic red precipitate associated with a positive Fehling's test.
