What is the order of kinetics in the SN1 mechanism ?
Correct answer: B. First
- A. Zero
- B. First
- C. Second
- D. Third
Explanation
SN1 means unimolecular nucleophilic substitution because the slow step involves only the substrate forming a carbocation; therefore, rate = k[substrate] and the reaction is first order. Students commonly choose second order by counting both the substrate and nucleophile, although the nucleophile is not involved in the slow step.
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About Nucleophilic Substitution
Nucleophilic substitution replaces a leaving group in an alkyl halide when an electron-rich nucleophile attacks the carbon atom. The topic compares SN1 and SN2 mechanisms, including reaction conditions, substrate structure, solvent effects, nucleophile strength, carbocation formation and stereochemical changes, and distinguishes substitution from elimination.
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