Describe how you could distinguish between ethanol, ethanoic acid, ethyl bromide and 2-methylpropan-1-ol.

First, you should add sodium hydrogen carbonate to all three compounds. Ethanoic acid will react with this to release a gas which will turn limewater cloudy.
Second, you should add acidified potassium dichromate. With ethanol, because it is a primary alcohol, the orange solution will turn to green. With 2-methylpropan-1-ol there will be no colour change because it is a tertiary alcohol.
Finally, the distinguish which solution is ethyl bromide you should add silver nitrate. A cream precipitate will be formed.