tests to distinguish between hydrocarbons

Question 1

test for an alkene and positive result

Answer 1

bromine water:
decolourises orange/brown bromine water

Question 2

test for a halogenoalkane and positive result

Answer 2

silver nitrate (acidified) :
forms a white silver halide ppt

Question 3

test for an alcohol and positive result

Answer 3

potassium dichromate: orange ^ turns green under reflux or distillation

Question 4

test for an aldehyde and positive result

Answer 4

Fehling’s solution: blue solution gives red ppt
tollens: silver mirror forms

Question 5

test for a COOH and positive result

Answer 5

sodium hydrogen carbonate: CO2 is released so effervescence