Sn2 Sterics
SN2 rate decreases in order:
Select the correct option:
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More halogen organics Practice Questions
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
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Formation of Grignard reagent fails in presence of:
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Best leaving group among given (in SN1):
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About This Question
- Subject
- chemistry
- Chapter
- halogen organics
- Topic
- sn2 sterics
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
CH3Cl > CH3CH2Cl > (CH3)2CHCl > (CH3)3CCl
- SN2 Mechanism: This is a single-step concerted process where the nucleophile attacks from the side opposite to the leaving group.
- Transition State: A pentacoordinate transition state is formed. Since the nucleophile must approach the central carbon, steric hindrance is the dominant factor.
- Steric Order: Methyl halides (CH3X) have the least hindrance, while tertiary halides ((CH3)3CX) are extremely crowded.
- Reactivity Order: Methyl > Primary > Secondary >> Tertiary.
- Applying to Options: CH3Cl>CH3CH2Cl>(CH3)2CHCl>(CH3)3CCl.
This easy difficulty chemistry question is from the chapter halogen organics, covering the topic of sn2 sterics. It appeared in the 2025 exam.
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