Organic tests

Question 1

Testing for alkenes

Answer 1

1) add bromine water = orange -> colourless

2) add potassium manganate = purple -> colourless (forms a diol)

Question 2

Testing for haloalkane type

Answer 2

1) Add aqueous sodium hydroxide solution
2) Nitric acid added
3) Add silver nitrate and observe colour change as usual

Question 3

Testing for alcohols

Answer 3

Adding acidified potassium dichromate will show a colour change from orange -> green in primary and secondary alcohols. No change in tertiary alcohols. Or using acidified potassium manganate will show purple -> colourless colour change

Question 4

Carboxylic acid test

Answer 4

Add sodium carbonate, causes fizzing of carbon dioxide gas