Introduction (Edexcel IGCSE Science (Double Award): Chemistry)

The structures of four organic compounds are shown. 

Which one does not show the displayed formula of the compound?

Ethene (C₂H₄) can be converted into chloroethene (C₂H₃Cl) in a two-stage process.

The first stage is to convert ethene into 1,2-dichloroethane, C₂H₄Cl₂  

Ethene is reacted with hydrogen chloride and oxygen. 

Complete the chemical equation for this reaction.

.......... C₂H₄ + .......... HCl + .......... O₂ → .......... C₂H₄Cl₂ + .......... H₂O

In the second stage, 1,2-dichloroethane is converted into chloroethene. 

C₂H₄Cl₂ → C₂H₃Cl + HCl 

This is a thermal decomposition reaction. 

State what is meant by the term thermal decomposition.

The diagram shows the displayed formula of chloroethene.

 i) State why chloroethene is described as an unsaturated compound.

(1)

 ii) Describe a test to show that chloroethene is unsaturated.

 (2)

Name the polymer formed from chloroethene.

The structures of six hydrocarbons are shown.

Which two compounds are isomers of one another?

Which of the following is not a feature of a homologous series? 

Which of the following reactions is an example of an addition reaction?