In this Group 7 tutorial we look at the properties and colours of the halogens e.g. low boiling points which goes back to the intermolecular forces topic. There are only two main reactions needed in this part: displacement and disproportionation. The displacement reaction can also be viewed as redox and ionic equations are often required. Disproportionation is a huge exam favourite with Edexcel Chemistry involving chlorine and NaOH or water.