In SN2 reaction, which of the following species is formed?
Correct answer: A. Transition state
- A. Transition state
- B. Intermediate
- C. Carbocation
- D. Carbanion
Explanation
Option A: In an SN2 reaction, a transition state is formed. The transition state represents the highest energy point in the reaction pathway where the reacting molecules are partially bonded and partially dissociated. It is a fleeting, high-energy species.Option B: In SN2 reactions, an intermediate species is not formed. The reaction proceeds via a concerted mechanism, meaning there is no stable intermediate species formed during the reaction.Option C: Carbocations (positively charged carbon ions) are not formed in SN2 reactions. Carbocations are more commonly associated with SN1 (substitution nucleophilic unimolecular) reactions.Option D: Carbanions (negatively charged carbon ions) are also not formed in SN2 reactions. Carbanions are more commonly involved in reactions such as nucleophilic substitution in certain cases, but not in the SN2 mechanism.
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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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