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A positive Tollen's test is given by compounds that have a free aldehyde or ketone functional group.
Sucrose is a disaccharide composed of the monosaccharides glucose and fructose. In sucrose, the components glucose and fructose are linked via an ether bond between C1 (carbon with aldehyde group) on the glucosyl subunit and C2 (carbon with ketone group) on the fructosyl unit. The bond is called a glycosidic linkage.
In other words, in sucrose there is no free aldehyde or ketone functional group. Hence sucrose will not answer Tollen's test.
What else can I help you with?
Why might a substance taste sweet but give a negative reaction with the Benedict's solution?
A substance could taste sweet due to the presence of natural sugars, while giving a negative reaction with Benedict's solution if the sugar present is a non-reducing sugar. Non-reducing sugars like sucrose do not react with Benedict's solution because they do not have the free aldehyde or ketone groups required for the reaction.
How do you make a 1 molar solution of sucrose?
To make a 1 molar solution of sucrose, you would weigh out 342.3 grams of sucrose (molecular weight of sucrose is 342.3 g/mol) and dissolve it in water to make a final volume of 1 liter. This would give you a solution where 1 mole of sucrose is dissolved in 1 liter of water.
How do you differentiate between glucose solution and sucrose solution?
One way is by polarimeter; glucose and sucrose rotate polarized light in opposite directions. This is assuming your materials are of biological origin and therefore consist of the D-forms of both; if they're synthetic, then all bets are off.
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.
Is sucrose magnetic?
No, sucrose is not magnetic. Sucrose is a non-magnetic compound because it does not contain any unpaired electrons that would give it magnetic properties.
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.
Why might a substance taste sweet but give a negative reaction with the Benedict's solution?
A substance could taste sweet due to the presence of natural sugars, while giving a negative reaction with Benedict's solution if the sugar present is a non-reducing sugar. Non-reducing sugars like sucrose do not react with Benedict's solution because they do not have the free aldehyde or ketone groups required for the reaction.
How do you make a 1 molar solution of sucrose?
To make a 1 molar solution of sucrose, you would weigh out 342.3 grams of sucrose (molecular weight of sucrose is 342.3 g/mol) and dissolve it in water to make a final volume of 1 liter. This would give you a solution where 1 mole of sucrose is dissolved in 1 liter of water.
How do you differentiate between glucose solution and sucrose solution?
One way is by polarimeter; glucose and sucrose rotate polarized light in opposite directions. This is assuming your materials are of biological origin and therefore consist of the D-forms of both; if they're synthetic, then all bets are off.
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.
Is sucrose magnetic?
No, sucrose is not magnetic. Sucrose is a non-magnetic compound because it does not contain any unpaired electrons that would give it magnetic properties.
How will aqueous solutions of sucrose and hydrogen chloride differ?
Hydrogen Chloride will ionize in water completely, since it's a strong acid, to give H+ and Cl- ions. The pH will be low...acidic. But the molecules of Sucrose in water will still remain molecules. They will not ionize or "dissociate" into separately moving ions. That's because HCl is ionic but Sucrose is molecular.
How many grams of sucrose would you add to water for a total volume of a 100 ml to make a 5 percent solution?
Molarity=[w/GMW]*[1000/volume(in mL)] 0.5=[w/342]*[1000/100]=17.1g similarly,34.2g sucrose is to dissolved in water and made up to 100mL to make 1molar solution and 171g to make 5molar solution.
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 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 .
Can sucrose cause ADD?
it can give you a sugar rush...
Which disaccharide does hydrolysis give glucose and fructose?
Sucrose is the disaccharide that, upon hydrolysis by the enzyme sucrase, yields glucose and fructose.
