Question

Glucose gives positive silver mirror test with ammoniacal silver nitrate
A. True
B. False

Answer 1

Hint: Ammoniacal silver nitrate solution is called Tollen’s reagent. In organic chemistry the Tollen's test is used to find the presence of an aldehyde functional group in the given compound. In Tollen’s test an aldehyde present in organic compounds is oxidized to a carboxylic acid.

Complete step by step answer:
-Tollen’s test is also called the silver mirror test.
-In the structure of the glucose there is an aldehyde functional group.
-The structure of the glucose is as follows.

-The reaction of aldehyde in glucose with Tollen’s reagent is as follows.

-In the above reaction silver (+1) is reduced to silver (0) metal, and which is going to deposit as a thin film on the inside of the glass test tube.
-Therefore Glucose gives a positive silver mirror test with ammoniacal silver nitrate.
-So, the given statement is True So, the correct answer is “Option A”.

Additional Information:
-Glucose comes under the category of aldoses due to the presence of aldehyde functional group.
-Glucose is a hexose containing six carbon atoms in its structure.
-Glucose also responds to Fehling’s test.
-Fructose also gives a positive test for Tollen’s reagent in basic medium. In basic medium fructose undergoes keto-enol tautomerism and responds to tollen’s test.

Note: This test is only for aldehydes, we cannot detect the presence of ketone functional groups in the given compound. The thin film formed in the inner surface of the test tube due to the deposition of the silver reflects our image, so it is called silver mirror test.