Detection of carbon-carbon double bonds
- In a test tube, a sample is taken.
- Bromine water, which is yellow in colour is added to the sample. The bromine water, if turns colourless will confirm the presence of carbon-carbon double bonds i.e. alkenes.
Detection of hydroxyl groups
- Hydroxyl groups in organic compounds can be tested by the Iodoform test.
- If a sample, when heated with sodium hydroxide and iodine turns colourless from yellow, it reflects the presence of hydroxyl group.
Detection of carboxylic acids
- For detection of carboxylic acids, sodium hydrogen carbonate is added with a taken sample. If a brisk effervescence is observed, it indicates the presence of carboxylic acid because carboxylic acids react with sodium bicarbonate to produce carbon dioxide which results in the formation of the effervescence.