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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 is the chemical equation for the reaction between glucose and Benedict's reagent?
.H-C=O + 4OH- + 2Cu2+ --> HO-C=O + Cu2O(s) + 2H2O.H-C-OH....................................H-C-OHHOC-H ....................................HOC-H.H-C-OH....................................H-C-OH.H-C-OH....................................H-C-OHH2C-OH....................................H2C-OH[Dots were used ..... to fill up spaces because repeating space bar will not work as space holder for vertical Fischer projection][Benedict's reagent will work out as Cu2+ in hydroxidic (OH-) solution]
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.
What reaction occurs when benzil gives tollens test?
Benzil does not react with Tollens reagent because it does not contain aldehyde or ketone functional groups. Tollens reagent is a silver mirror test used for the detection of aldehydes in a sample by the reduction of silver ions to metallic silver. Benzil, being a diketone, does not undergo this reaction.
How do you distinguish between glucose and maltose using Benedicts reagent?
Sucrose is made by the glosidic linkage between glucose and fructose whereas maltose is made by the glycosidic linkage between two glucose molecules. the first figure is maltose and second is sucrose(courtesy google images)
A reducing sugar gives a precipitate of silver metal with Benedict's reagent.?
This is probable an error.
What substrate gives a positive reaction for benedicts reagent?
Reduction of Benedict's reagent occurs with reducing sugars such as glucose, fructose, and galactose, giving a positive test result. This test is used to detect the presence of reducing sugars in various food products.
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.
Sugar in blood and urine is tested with which solution?
Sugar in blood and urine is tested with Benedict's solution.
What is the chemical equation for the reaction between glucose and Benedict's reagent?
.H-C=O + 4OH- + 2Cu2+ --> HO-C=O + Cu2O(s) + 2H2O.H-C-OH....................................H-C-OHHOC-H ....................................HOC-H.H-C-OH....................................H-C-OH.H-C-OH....................................H-C-OHH2C-OH....................................H2C-OH[Dots were used ..... to fill up spaces because repeating space bar will not work as space holder for vertical Fischer projection][Benedict's reagent will work out as Cu2+ in hydroxidic (OH-) solution]
Is fructose gives positive test with tollens reagent?
Fructose does not give a positive test with Tollens' reagent because it is a reducing sugar that does not have a free aldehyde group capable of reducing the Tollens' reagent. Tollens' reagent is typically used to detect the presence of aldehydes but may not react with fructose due to its ketone functional group.
What is Benedict test for?
You must take the testing object, then add Benedict's solution in a test tube. Then in a boiling beaker of water, place the test tube in. Let it sit there and see if there is any color change or precipitated materials.
Why is Benedict's test unreliable?
Benedict's test is considered unreliable because it can give false positive or false negative results. It may not accurately differentiate between reducing sugars and other substances that can also react with the Benedict's reagent, leading to inaccurate conclusions about the presence of sugars in a sample. Additionally, the test may not detect certain types of sugars or may give inconsistent results depending on factors such as temperature and pH.
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.
When does a spray of diphenylamine reagent on TLC gives blue coloration?
Diphenylamine is a reagent for DNA.
