Which of the following pairs will give the 'T | vedclass

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(B) The 'Tollens' test' is a chemical test used to distinguish between an aldehyde and a ketone. It is given by compounds containing a free aldehyde g

Vedclass · Accepted Answer

Glucose,Fructose

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(B) The 'Tollens' test' is a chemical test used to distinguish between an aldehyde and a ketone. It is given by compounds containing a free aldehyde group $(-CHO)$ or those that can tautomerize to form an aldehyde group in an alkaline medium.Glucose is an aldose and contains a free aldehyde group,so it gives a positive 'Tollens' test'.Fructose is a ketose,but in an alkaline medium (used in the 'Tollens' reagent),it undergoes tautomerization to form glucose and mannose,which contain aldehyde groups,thus it also gives a positive 'Tollens' test'.Sucrose is a non-reducing sugar because its glycosidic linkage involves the anomeric carbons of both glucose and fructose,preventing the formation of a free aldehyde group. Therefore,it does not give the 'Tollens' test'.

Which of the following pairs will give the 'Tollens' test'?

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