Functional group tests
Practical Organic Chemistry · Chemistry
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An unknown gives a silver mirror with Tollens but no CO₂ with NaHCO₃. Identify the group. Step 1: Tollens positive → aldehyde (–CHO reduces Ag⁺ to Ag mirror). Step 2: NaHCO₃ negative → not a carboxylic acid. Step 3: Aldehyde confirmed; Fehling would also give red Cu₂O. Step 4: Ketones fail Tollens — so it's an aldehyde, not a ketone!