Revision:Tests for organic compounds
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Test for a carbonyl
- Reagents: 2,4-dinitrophenylhydrazine (2,4-DNPH)
- Observation with a positive test: Orange precipitate when added to a carbonyl
Test for an aldehyde
- Reagents: Fehlings solution 1 and 2
- Observation with a positive test: Red precipitate when reagents are warmed with an aldehyde
Test for an aldehyde
- Reagents: Tollen's reagent (
dilute ammonia solution)
- Observation with a positive test: Silver mirror with an aldehyde
Test for an alcohol
- Reagents: PCl5 in dry conditions
- Observation with a positive test: Steamy fumes of HCl gas which turns damp blue litmus paper red
Test for a carboxylic acid
- Observation with a positive test: CO2 gas which turns lime water milky
Test for an alcohol
- Observation with a positive test: H2 gas
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