Alkyl Halides
The order of reactivity of alkyl halides in SN1 reaction is:
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing halogens
- Topic
- alkyl halides
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
3° > 2° > 1°
The SN1 (Substitution Nucleophilic Unimolecular) mechanism proceeds through the formation of a carbocation intermediate.
- Step 1 (RDS): Formation of carbocation by leaving group departure.
- Step 2: Rapid attack of the nucleophile.
- The rate of reaction depends solely on the stability of the carbocation formed.
- Stability Order: 3∘ (Tertiary) >2∘ (Secondary) >1∘ (Primary) >CH3+ (Methyl).
- This is due to inductive effect (+I) and hyperconjugation from alkyl groups which disperse the positive charge. Therefore, tertiary halides are most reactive in SN1.
This easy difficulty chemistry question is from the chapter organic compounds containing halogens, covering the topic of alkyl halides. It appeared in the 2025 exam.
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