Press "Enter" to skip to content

Which compounds would give a positive tollens test?

Ketones will give a positive Tollens’ test.

Which compound will react with tollens reagent?

Tollens’ reagent is an alkaline solution of ammoniacal silver nitrate and is used to test for aldehydes. Silver ions in the presence of hydroxide ions come out of solution as a brown precipitate of silver(I) oxide, Ag2O(s). This precipitate dissolves in aqueous ammonia, forming the diamminesilver(I) ion, [Ag(NH3)2]+.

How many of the following give positive tollen’s test?

Aldehydes and – hydroxy ketones give positive Tollens test. Glucose has an aldehydic group and fructose is a hydroxy ketone.

Which compound does not react with tollens reagent?


Which of the following compounds will not give positive tollen’s test?

Solution : Compound given in option(a) ,(b) and (d)to not have any hemi acetal group so can’t oxidised by Tollen’s reagent and will not give Tollen’s test. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

Why glucose does not react with Schiff reagent?

Glucose contains an aldehyde group in its open structure but forms a cyclic acetal structure(also called pyranose). This structure is quite stable and is not broken down by Schiff’s reagent which is a weak base. Hence, it does not form hydrazone giving a negative Schiff’s test.

What is Schiff’s base How is it formed?

Schiff’s bases are formed when any primary amine reacts with an aldehyde or a ketone under specific conditions. In other words, it is a nitrogen analogue of a ketone or aldehyde where the carbonyl group has been replaced by azomethine or imine group.

Which amino acid can form a Schiff base?


What is an imine functional group?

Imine (Schiff base): A functional group having a carbon-nitrogen double bond (C=N), or a molecule containing this functional group.