alleryReactivity order for SN2 reactions (1°, 2°, 3°):
A1° > 2° > 3°
B3° > 2° > 1°
C1° > 2° > 3° (steric)
DSame
Answer & Solution
Correct answer: C. 1° > 2° > 3° (steric)
**SN2:** backside attack hindered by bulk.
Primary fastest, tertiary essentially doesn't undergo SN2. Reverse for SN1 (3° > 2° > 1°).
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