Question:
SN2 reactions are favoured by:
SN2 reactions are favoured by:
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$S_{N}2$ loves "space" (Primary) and "free" nucleophiles (Aprotic solvents).
Updated On: May 5, 2026
- Tertiary substrates
- Polar protic solvents
- Primary substrates and polar aprotic solvents
- Secondary substrates and heat
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The Correct Option is C
Solution and Explanation
Step 1: Concept
$S_{N}2$ (Substitution Nucleophilic Bimolecular) reactions involve a single-step mechanism where the nucleophile attacks from the backside.
Step 2: Meaning
Because the attack happens simultaneously with the leaving group departing, steric hindrance must be minimized.
Step 3: Analysis
Primary substrates are least hindered, making them ideal for $S_{N}2$. Furthermore, polar aprotic solvents (like DMSO or acetone) do not solvate the nucleophile strongly, keeping it reactive.
Step 4: Conclusion
Tertiary substrates and polar protic solvents instead favor the $S_{N}1$ mechanism. Final Answer: (C)
$S_{N}2$ (Substitution Nucleophilic Bimolecular) reactions involve a single-step mechanism where the nucleophile attacks from the backside.
Step 2: Meaning
Because the attack happens simultaneously with the leaving group departing, steric hindrance must be minimized.
Step 3: Analysis
Primary substrates are least hindered, making them ideal for $S_{N}2$. Furthermore, polar aprotic solvents (like DMSO or acetone) do not solvate the nucleophile strongly, keeping it reactive.
Step 4: Conclusion
Tertiary substrates and polar protic solvents instead favor the $S_{N}1$ mechanism. Final Answer: (C)
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