Sn2 Reaction
Easychemistry
SN2 reaction is favored by:
Select the correct option:
Solution
Incorrect! Answer:
Primary halides
The SN2 (Substitution Nucleophilic Bimolecular) mechanism involves a simultaneous bond-breaking and bond-forming event via a transition state.
- The nucleophile attacks from the back side (opposite to the leaving group), leading to an Inversion of Configuration (Walden Inversion).
- Because the nucleophile must approach the carbon center, the reaction is extremely sensitive to steric hindrance.
- Reactivity Order: CH3X>1∘>2∘≫3∘.
- Primary halides are least crowded, offering less resistance to the incoming nucleophile, and thus react most rapidly.
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing halogens
- Topic
- sn2 reaction
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Primary halides
The SN2 (Substitution Nucleophilic Bimolecular) mechanism involves a simultaneous bond-breaking and bond-forming event via a transition state.
- The nucleophile attacks from the back side (opposite to the leaving group), leading to an Inversion of Configuration (Walden Inversion).
- Because the nucleophile must approach the carbon center, the reaction is extremely sensitive to steric hindrance.
- Reactivity Order: CH3X>1∘>2∘≫3∘.
- Primary halides are least crowded, offering less resistance to the incoming nucleophile, and thus react most rapidly.
This easy difficulty chemistry question is from the chapter organic compounds containing halogens, covering the topic of sn2 reaction. It appeared in the 2025 exam.
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