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Why starch does not give with fehling test?
Starch doesnot give positive result for Fehling's test as it does not have a free hemiacetal group
Does formalin give positive Fehling's solution test?
Formalin gives a positive Fehling's solution test.
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.
Which aldehyde do not give fhelings test?
All aldehydes give a positive result with Fehling's test. All ketones give negative results.
Why benzaldehyde doesn't give fehling solution test?
Benzaldehyde is the simplest aromatic aldehyde. The oxidizing agent used in Fehling's solution is not strong enough to oxidize the aromatic ring. Therefore Benzaldehyde doesn't show Fehling's test. I hope it helped :)
Is fehling test positive for gluconic acid?
No. Fehling's test is positive for glucose which forms gluconic acid as the product.
Does formic acid fehling's test?
No, Fehling's Test will have no reaction with Formic Acid HCOOH + 2CuSO4 + 4NaOh ---> no Reaction
Why dont polysaccharides give a positive test with Fehling's solution?
Fehling test is only suitable for reducing sugars, that means, monosaccharides in its open form with an aldehyd available. Polysacchardes have the aldehydes in a acetal form and they can not react
Is one teaspoon fresh lemon juice the same as one teaspoon of lemon juice made from concentrate?
No, concentrated lemon juice is about four times as concentrated as regular lemon juice. Therefore one teaspoon of fresh lemon juice is equivalent to 1/4 teaspoon of concentrated lemon juice.
Will lemon juice mask saliva drugs test?
only if your mouth is full of lemon juice WHEN they swab it . kinda foolish to think this lemon will just make you salivate MORE
Will glyoxal respond to fehling test?
no
Why para-formaldehyde doesn't give positive fehling's test?
Because it is a polymer of formaldehyde with no free aldehydic group.
