Organic Qualitative Tests Flashcards
1
Q
Test for Alcohols
A
Add K2Cr2O7/H+
Orange -> green
(Indicates primary or secondary alcohol)
2
Q
Test for Alkenes
A
Add bromine water
Orange -> colourless
3
Q
Test for haloalkanes
A
Dissolve in ethanol, add water, then do halide ion test with silver nitrate
4
Q
Test for aldehyde or ketone
A
Add 2,4 DNP (Brady’s)
Orange precipitate observed
5
Q
Test for aldehyde only
A
Add Tollen’s reagent
Silver mirror forms
6
Q
Test for carboxylic acid
A
Add carbonate
Effervescence (CO2 forms)
7
Q
Test for benzene
A
Add bromine water at room temp - no reaction
8
Q
Test for phenol
A
- Turns blue litmus paper red
- Decolourises bromine water and forms white precipitate
