Question

tolens test for aldehydes 150 words​

Answer 1

Explanation:

Tollens’ test, also known as silver-mirror test, is a qualitative laboratory test used to distinguish between an aldehyde and a ketone. It exploits the fact that aldehydes are readily oxidized (see oxidation), whereas ketones are not. Tollens’ test uses a reagent known as Tollens’ reagent, which is a colorless, basic, aqueous solution containing silver ions coordinated to ammonia [Ag(NH3)2+]. It is prepared using a two-step procedure.

Step 1: Aqueous silver nitrate is mixed with aqueous sodium hydroxide.

AgNO3+NaOH2AgOH→AgOH+NaHO3→Ag2O+H2O

Step 2: Aqueous ammonia is added drop-wise until the precipitated silver oxide completely dissolves.

Ag2O+4NH3+H2O→2Ag(NH3)+2+2OH−