Free Radical Mechanisms Menu
Free Radical Substitution
A brief explanation of the terms free radical and substitution.
Free radical substitution of hydrogen atoms in methane by chlorine atoms. Includes multiple substitution if you need it.
Walkthrough of the mechanism
Multiple substitution
Free radical substitution of hydrogen atoms in methane by bromine atoms. Includes multiple substitution if you need it.
Walkthrough of the mechanism
Multiple substitution
Free radical substitution of hydrogen atoms in the methyl group in methylbenzene by chlorine atoms in the presence of UV light (sunlight).
Walkthrough of the mechanism
Multiple substitution
Questions to test your understanding
These questions cover all of the work on free radical substitution.
Questions on free radical substitution AnswersFree Radical Addition
The mechanism for the polymerisation of ethene under free radical conditions.
Walkthrough of the mechanism
The mechanism for the addition of hydrogen bromide to alkenes under free radical conditions. This is often known as the "peroxide effect".
Walkthrough of the mechanism
You might also be interested in:
A survey of all the physical and chemical properties of alkanes required by UK A-level syllabuses.
For more about the reactions and physical properties of alkenes like ethene and propene.
A link to the arenes (aromatic hydrocarbons) section of the site.