Type 4 Lewis acid/base complex (generic) 1 Reaction forms: Type 4 Lewis acid/base complex (generic)   Special class of generic used to represent "generic chemical reactivity behaviour" rather than structure. Read more about the different types of Lewis acid, Lewis base and Lewis acid/base complex in the Chemogenesis web book and here. Type 4 Lewis acid/base complex (generic) is defined with respect to the entities below: The entities below are defined with respect to: Type 4 Lewis acid/base complex (generic) Allyl cation (generic) Benzene Benzonium ion Cyclohexene Cyclopentadiene Cyclopropene Diphenylmethane 9-Phenylfluorene Propene Toluene chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis