What is true about the mechanisms I and II
Correct answer: D. (I) is SN2, (II) is SN1
- A. Both are SN1
- B. (I) is SN1, (II) is SN2
- C. Both are SN2
- D. (I) is SN2, (II) is SN1
Explanation
In mechanism I, the reaction follows an SN2 pathway. This involves a single concerted step where the nucleophile attacks the substrate directly, typically seen in primary substrates and with strong nucleophiles. In contrast, mechanism II follows an SN1 pathway, which involves a two-step process: first, the formation of a carbocation intermediate, followed by nucleophilic attack. SN1 reactions are more common with tertiary substrates and in polar protic solvents. Options A, B, and C are incorrect because they do not accurately reflect the characteristics of the SN1 and SN2 mechanisms as described.
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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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