0
Can 24-dinitrophenylhydrazine reagent distinguish between an aldehyde and a ketone?
Wiki User
∙ 14y ago
No, it would only tell you that a carbonyl group is present. To distinguish between aldehydes and ketones, you would use Tollen's Reagent. If it's an aldehyde, a silver mirror would be formed as the aldehyde would've oxidised and formed carboxylic acid. If it's a ketone, then no reaction would take place as ketones are resistant to further oxidation.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Why pyrrole-2-aldehyde does not respond to tollens reagent?
Pyrrole-2-aldehyde does not respond to Tollens reagent because it is not a reducing sugar. Tollens reagent (silver nitrate) is used to test for the presence of aldehyde groups, which are commonly found in reducing sugars. Reducing sugars contain aldehyde groups and are capable of donating electrons to Tollens reagent, forming a silver mirror on the test tube wall. Pyrrole-2-aldehyde does not contain aldehyde groups, and therefore is not a reducing sugar. As a result, it does not react with Tollens reagent.
What is the function of Fehling's test?
Fehling's test is used to differentiate between aldehyde and ketones group. An aldehyde group will react with Fehling's reagent to give cuprous oxide resulting in a red precipitate. A Ketone group will not react with Fehling's reagent.
What is the reaction of acetone and tollens reagent?
Tollens' reagent is used to determine whether a carbonyl containing compound is an aldehyde or a ketone. Acetone is a ketone so it will not readily react with Tollens' reagent.
What is the reagent to distinguish alkene and alkyne?
Bromine
Why is fructose oxidized by fehling's reagent even though it is a ketose?
Fehling's reagent contains CuO and NaOH. I think fructose could give a positive test because the OH- can react with the sugar and "move" the carbonyl around the carbon backbone, including to the terminal position, forming an aldehyde. If the aldehyde reacts with the CuO pretty quickly, then you may have created an "aldehyde sink" that could consume all of your fructose into the carboxylic acid.
Why pyrrole-2-aldehyde does not respond to tollens reagent?
Pyrrole-2-aldehyde does not respond to Tollens reagent because it is not a reducing sugar. Tollens reagent (silver nitrate) is used to test for the presence of aldehyde groups, which are commonly found in reducing sugars. Reducing sugars contain aldehyde groups and are capable of donating electrons to Tollens reagent, forming a silver mirror on the test tube wall. Pyrrole-2-aldehyde does not contain aldehyde groups, and therefore is not a reducing sugar. As a result, it does not react with Tollens reagent.
What is the function of Fehling's test?
Fehling's test is used to differentiate between aldehyde and ketones group. An aldehyde group will react with Fehling's reagent to give cuprous oxide resulting in a red precipitate. A Ketone group will not react with Fehling's reagent.
what is the equation for this aldehyde plus acidified potassium permanganate aldehyde plus Tollen's reagent aldehyde plus NaOH Cannaizarro's reaction aldehyde plus Fehling's rgt aldehyde plus Sodium H?
the equation for this are? aldehyde + acidified potassium permanganate RCHO + 2KMnO4 + H2SO4 → RCOOH + K2SO4 + 2MnO2 ↓+ H20 aldehyde + Tollen's reagent RCHO + 2AgNO3 + 2NH4OH → RCOOH + 2Ag↓ + 2NH4NO3 +H2O aldehyde+ Fehling's reagent RCHO + 2CuSO4 + 4NaOH →RCOOH + Cu2O↓+ 2Na2SO4 + 2H2O THAT's ALL I KNOW aldehyde + Sodium Hydrogen Sulfite
What is the reaction of acetone and tollens reagent?
Tollens' reagent is used to determine whether a carbonyl containing compound is an aldehyde or a ketone. Acetone is a ketone so it will not readily react with Tollens' reagent.
What is the reagent to distinguish alkene and alkyne?
Bromine
What is Borch's reagent used for?
It's sodium cyanohidridoborate; qualitatively detect the carbonyl functionality of a ketone or aldehyde functional group.
Why is fructose oxidized by fehling's reagent even though it is a ketose?
Fehling's reagent contains CuO and NaOH. I think fructose could give a positive test because the OH- can react with the sugar and "move" the carbonyl around the carbon backbone, including to the terminal position, forming an aldehyde. If the aldehyde reacts with the CuO pretty quickly, then you may have created an "aldehyde sink" that could consume all of your fructose into the carboxylic acid.
Maltose will reduce cupric ion in Fehling's reagent?
Yes, it will. Maltose has a free aldehyde group in its linear form, then this aldehyde reduces Cu2+ forming the cuprous oxide (CuO) which is a reddish precipitate. This is the Fehling reaction.
What compound can be oxidized by both Benedicts solution and Tollens reagent?
All the compounds having free aldehyde group as reducing sugars.
How is a positive Schiff's test recognized?
When an unknown sample is added to the decolorized Schiff's reagent and an aldehyde is present, a magenta of purple color develops. ^^
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 a Benedict's reagent?
To favor the existence of the free aldehyde form by suppressing ring formation. If the sugar exist in the ring form it can not react
