In groups, students analyze and sort 5 substituents based on whether they are activating or deactivating groups at a whiteboard or interactive board. Groups switch boards to peer review and annotate another group’s work before returning to their original board to discuss the comments made by their peers.
Each group then selects one activating and one deactivating substituent from their sorted compounds to add to the benzene ring. They draw resonance structures for both. This is followed by another period of peer review and annotation by another group.
The instructor then assigns each group a distinct reagent to carry out electrophilic aromatic substitution onto benzene rings attached to each substituent students previously sorted. Groups complete these five reactions, then once again switch whiteboards to peer review and annotate another groups work.
Groups then circulate around the room (gallery walk) to examine and discuss all finalized reactions posted by their peers. Each group compiles a flow chart outlining the steps required to solve a electrophilic aromatic substitution problem. Individual students then, out of class, apply their flow chart in solving related questions, modifying it until it is robust and using it as a study aid for future examinations.
Students will learn to identify and sort activating and deactivating substituents in electrophilic aromatic substitution, draw resonance structures for benzene, and examine substituent effects in electrophilic aromatic substitution.
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