20.2 - Hydrocarbons

20.2.1: State and explain the low reactivity of alkanes in terms of the inertness of C­H and C­C bonds.

20.2.2: State that alkanes can react with halogens and distinguish between homolytic and heterolytic fission. Students should be able to define and recognize a free radical. Mechanisms are not required.

20.2.3: Describe and explain the structure of benzene using chemical and physical evidence. Consider the special stability of the ring system (heat of combustion or hydrogenation of C6H6 in comparison to that of cyclohexene, cyclohexadiene and cyclohexatriene), as well as benzene's tendency to undergo substitution rather than addition reactions.

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