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Question

Glucose gives silver mirror with Tollen's reagent, it shows the presence of:

A
a ketonic group
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B
an aldehydic group
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C
an alcoholic group
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D
an acidic group
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Solution

The correct option is C an aldehydic group
Glucose gives silver mirror test with Tollen's reagent. It is due to the presence of an aldehydic group (CHO). Tollen's reagent is silver ammonia complex. It is mild oxidisng agent and oxidises aldehyde group to carboxylate ion. Tollen's reagent itself is reduced to metallic silver.

C5H11O5CHOGlucose+2Ag(NH3)2OH(Tollensreagent)C5H11O5COOHGluconicacid+2AgSilver mirror+2H2O+4NH3

Option B is the correct answer.

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