Distinguish two organic compounds
“Give a chemical test to distinguish between…” - type the two compounds and get every test that tells them apart, with the reagent and what each one shows.
Answer
Warm or treat each with I2 and NaOH, warm: propanal gives no change, propanone gives yellow precipitate of iodoform, CHI3.
Every test that tells them apart
| Test | Reagent | propanal | propanone |
|---|---|---|---|
| Iodoform | I2 and NaOH, warm | no change | yellow precipitate of iodoform, CHI3 |
| Tollens | Tollens' reagent (ammoniacal AgNO3), warm | silver mirror | no change |
| Fehling | Fehling's solution, warm | red-brown precipitate of Cu2O | no change |
| Schiff | Schiff's reagent | pink colour returns | no change |
The two compounds
aldehyde
ketone, methyl ketone or CH3CHO
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