Which does not react with Fehling reagent?

Which does not react with Fehling reagent?

Fehling solution is weak oxidising agent and benzaldehyde is weak reducing agnet. Hence, it does not react with Fehling solution . Formic acid, glucose, ethanal contains CHO – group. Hence , they reduce Fehling solution.

What reacts with Fehling solution?

Fehling’s solution is used to distinguish between aldehyde and ketone functional groups. Aldehydes oxidize to give a positive result but ketones won’t react to the test (except for α-hydroxy ketones). Fehling’s test is used as a general test for determining monosaccharides and other reducing sugars.

Which compounds will not reduce Fehling’s solution?

Aromatic aldehydes do not reduce Fehling’s solution.

Which of the following compounds will give positive test with Fehling solution?

The Glucose structure has an aldehyde group and due to which it gives a positive test for Fehling’s solution. Thus, the right answer is (B) Glucose.

Why Fehling’s test is not given by aromatic aldehydes do?

In aromatic aldehydes, the -CHO group is attached to a benzene ring. Due to resonance, carbonyl group’s C acquires a double bond character with the benzene which is very strong to break. The oxidizing agents like Cu2+ are unable to break that bond, so such aldehydes are unable to show fehling’s test.

Which of the following does not react with Fehling solution to give Red PPT?

with Fehling solution? Acetone. Ketones do not respond to this test.

Does Fehling’s solution react with alcohols?

Fehling’s solution does not oxidize alcohols because the copper complex does not have enough oxidizing power to activate alcohols (maybe easily oxidized alcohols like benzyl alcohol or p-methoxylbenzyl alcohol or phenol might give false positives).

What happens in Fehling’s test?

Fehling’s solution can be used to distinguish aldehyde vs ketone functional groups. The compound to be tested is added to the Fehling’s solution and the mixture is heated. Aldehydes are oxidized, giving a positive result, but ketones do not react, unless they are α-hydroxy ketones.

Which of the following does not give Fehling’s test?

Fehling’s test is given only by reducing sugars. When Fehling’s solution is added to any reducing sugar then a red precipitate is formed which shows that reduction has taken place. Sucrose does not give this test.

Which of the following compounds can be distinguished by Fehling’s test?

Which of the following does not give Fehling test?

Which of the following compound can be distinguished by Fehling’s test?

So the conclusion is that we can use Fehling’s solution to distinguish acetaldehyde and benzaldehyde.