SN1 reactions have which of the following species formed and consumed in the reaction?
Correct answer: B. Intermediate
- A. Transition state
- B. Intermediate
- C. Carbanion
- D. Carbene
Explanation
Option B is correct since SN1 reactions involve two steps and in the first step, carbonium ion form is positive. This carbonium ion is used in the second step. Therefore, it serves as an intermediate. Option A is incorrect since a transition state is a feature of the SN2 mechanism, not SN1. Option C is incorrect since carbanion (negative) is not formed in an SN1 reaction, it is the carbonium ion positive which is formed. Option D is incorrect since carbene is not formed in the SN1 reaction. A carbene is a molecule containing a neutral carbon atom with a valency of two and two unshared valence electrons.
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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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