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Bond fission: homolytic
The bonds break evenly and each bonding atom receives one electron from the bonded pair = free radicals
Heterolytic fission
Bonds break unevenly one of the bonded atoms receive the pair of electrons producing ions
Curly arrow
Shows the movement of pair of elections
Free radical substitution.
Problems with free radical substitution
You can get mixture of products
To combat this → have excess of reactant that isn't the halogen
Can get a mixture of isomers as the reaction can take place at any point of the chain
Catalytic cracking
Turns long hydrocarbon chain into smaller alkane and alkene