Explain the Tollens' test to distinguish aldehydes from ketones w… - Vidyadip

Question

Explain the Tollens' test to distinguish aldehydes from ketones with equation. ### Write a note on silver mirror test.

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Answer

→ Tollens' test: On warming an aldehyde with freshly prepared ammoniacal silver nitrate solution (Tollens' reagent), a bright silver mirror is produced due to the formation of silver metal. The aldehydes are oxidised to corresponding carboxylate anion. The reaction occurs in alkaline medium.
RCHO + 2[Ag(NH₃)₂]⁺+ 3OH^-→ RCOO^- + 2Ag + 2H₂O + 4NH₃

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