Which of the following is a one-step reaction?
Correct answer: D. SN2
- A. SN1
- B. E1
- C. Free radical substitution reaction
- D. SN2
Explanation
SN2 reactions are nucleophilic substitution reactions in which the rate-determining step involves two chemical species, hence they are bimolecular reactions. The rate of the reaction is determined by the concentration of those two species. SN2 reactions involve a single step in which the attacking nucleophile forms a bond with the carbon atom and the displaced species simultaneously leaves. SN1 and E1 are two-step reactions, whereas free radical substitution has three steps, namely initiation, propagation, and termination.In the example given below, -OH group attacks and -Cl group leaves, simultaneously.
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About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
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