Two numbered test tubes contained glycerol (test tube 1) and glucose (test tube 2). The group of pupils was given a task in the laboratory: using copper (II) hydroxide, determine which substance is in each test tube!
a) Write down what observations the students saw in each test tube during their experiments!

b) Based on the properties of the two substances, explain your answer briefly (in about three sentences)!
c) What other reagents could be used to carry out this type of practical work? 

d) What observations would this group of students then see?