A summary guide for all of the mechanisms covered in AS level chemistry (AQA). This includes: (1) nucleophilic substitution with CN-, OH- & NH3 (2) free radical substitution (3) electrophilic addition with HBr, Br2, H2SO4 & H2O (4) elimination with OH- and H2SO4. For each mechanism is an example equation, drawing and the reaction conditions, which should be memorised. I hope that this resource proves useful for revising organic mechanisms.