Test-tube reactions for functional groupsAQA A-Level Chemistry: Mind map

Exam questions on Test-tube reactions for functional groups

1. A technician has four unlabelled bottles. Each contains one of hex-1-ene, hexan-1-ol, hexanal and hexanoic acid. She labels them W, X, Y and Z and plans simple test-tube reactions to identify each liquid.
   Write an equation for the reaction of hexanoic acid with aqueous sodium carbonate.2 marks
2. A student is given an organic liquid that might be a halogenoalkane. She warms it with aqueous sodium hydroxide, cools the mixture, acidifies it with dilute nitric acid and then adds aqueous silver nitrate. A cream precipitate forms.
   Name the type of reaction between the halogenoalkane and aqueous sodium hydroxide, and explain how this reaction leads to the cream precipitate.2 marks
3. An analyst has an unlabelled liquid with the molecular formula C₃H₆O. It could be propanal, propanone or prop-2-en-1-ol, CH₂=CHCH₂OH.
   Describe the observations when each of the three compounds is warmed separately with acidified potassium dichromate(VI) and with Tollens' reagent.3 marks