Elimination bimolecular reactions involve____________________________?
Correct answer: B. second order kinetics
- A. first order kinetics
- B. second order kinetics
- C. third order kinetics
- D. zero order kinetics
Explanation
An E2 elimination occurs in one concerted step and its rate depends on both the substrate and the base, so the rate law contains two concentration terms and has second-order kinetics. Students may choose first order by confusing E2 with the unimolecular E1 mechanism.
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About Elimination Reactions
Elimination reactions remove a leaving group and a hydrogen atom from adjacent carbon atoms to form an alkene. The topic covers dehydrohalogenation of alkyl halides, E1 and E2 mechanisms, the role of base, solvent and substrate structure, and Zaitsev orientation, which is often contrasted with substitution.
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