What chemical tests can be used to distinguish between polymer and propene?

Answer 1

Propene is an alkene, whereas propane is an alkane. Thus, propene is an unsaturated molecule, having a carbon-carbon double bond. If you add bromine water, an aqueous solution of bromine, to the test tubes, you can tell which is propene, the alkene. The bromine reacts with and saturates the double bonds in alkenes, and so decolourises. The bromine does not decolourise when added to an alkane as it does not react. So, in conclusion:

• Add bromine water (brown) to the test tubes
• If the bromine water stays brown, the test tube contains propane
• If the bromine water goes colourless, the test tube contained propene.

Answer 2

1 propanol and 2propanol can be distinguished by lucas test. 2 propanol produces cloudiness within 5 minutes with lucas reagent. The cloudiness is due to the formation of immiscible alkyl halide. But 1 propanol does not react with lucas reagent at room temperature

Answer 3

Propene would satisfy the test for unsaturation, like the addition of bromine water which would yield decolorisation, while this would be absent for polymers, in which alll double bonds would be opened up.Thus all possible tests would :

1. Bromine water addition in carbon tetrachloride medium

2. Addition of Baeyer's reagent; decolorization of purple to colorless

3. Heating to give sooty flame indicates high degree of unsaturation.

Answer 4

tollens silver mirror test. it gives a silver mirror for aldehyde.