Testing for alkenes and Carboxylic acids

Question 1

what is the test for alkene

Answer 1

1) Add bromine water to alkene
2) solution turns colourless

Bromine water is reacting with the double bond in the alkene.
The colourless solution formed is dibromoalkane

This is an electrophilic addition reaction

Question 2

what is the test for carboxylic acids

Answer 2

involves reacting the carboxylic acid with a carbonate

1) Add a carbonate ( Eg sodium hydrogencarbonate) to the carboxylic acids and CO2 and water is produced.