A Knowledge organiser on for 11th and 12th grade (A-Level) organic chemistry, the hydrocarbons (Alkanes and alkenes) including: naming, intermolecular forces, general formulae, structual & Geometric isomers, reactions of alkanes: oxidation and free radical substitution (with chlorine). Reactions of alkenes with hydrogen, bromine water, steam, hydrogen halides, potassium managanate. Covalent bonding (sigma/pi bonds), addition polymerisation, use as fuels, fractional distillation, cracking reforming etc. Mechanisms: Free radical substitution and electrophilic addition (markovnikov & the inductive effect). The resource will print onto A4 and then can be expanded clearly onto A3. An editable PowerPoint file is included allowing editing if desired.