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.