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Q: Is fructose gives positive test with tollens reagent?
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Why fructose gives positive tollen reagent test?

Only aldehydes give a positive Tollens test. However, under the strongly basic conditions of the test, alpha-hydroxy ketones can isomerize to aldehydes, so they will also give a positive Tollens test. Fructose is an alpha-hydroxy ketone.


What substances give a positive tollens test?

When adding the aldehyde or ketone to Tollens' reagent, the test tube is put in a warm water bath. If the reactant under test is an aldehyde, Tollens' test results in a silver mirror. If the reactant is a ketone, it will not react because a ketone cannot be oxidized easily. A ketone has no available hydrogen atom on the carbonyl carbon that can be oxidized - unlike an aldehyde, which has this hydrogen atom.


What is the difference between Benedict's Reagent and Biuret Reagent?

Benedicts reagent is used to check reducing sugars , it need hat to work and gives red color when positive ,. While biuret reagent is for proteins .there is no need to use heat and gives purple , violet color when positive ..


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 .


Is Pararosaniline is schiff's reagent?

No, its reaction with SO2(aq) gives schiff's reagent.


Can Seliwanoff's test be used to distinguish sucrose from fructose?

Yes, fructose is a ketose, for which Seliwanoff's test is most sensitive. Sucrose is neither entirely a ketose nor an aldose, but is a mixture of both. It will react, but more slowly, producing a much lighter pinkish color.


When does a spray of diphenylamine reagent on TLC gives blue coloration?

Diphenylamine is a reagent for DNA.


When you add Fructose and fructose does it gives you glucose?

No. Fructose and glucose are two different, simple sugars or monosaccharides. Fructose is a ketohexose. Glucose is an aldohexose.


What does Hydrolysis give?

hydrolysis gives glucose and fructose


What are the functions of fructose?

It gives supply of quick energy


What Upon hydrolysis gives glucose and fructose?

Sucrose


Why ether is used instead of water in Grignards reagent?

it is used because it gives power