Key Idea: The relative reactivity of alkyl halides towards SN2 reactions is as follows: Primary > Secondary > Tertiary However, if the primary alkyl halide or the nucleophile/base is sterically hindered the nucleophile will have difficulty to getting the back side of the α-carbon as a result of this, the elimination product will be predominant. Here CH3CH2Br is the least hindered, hence it has the highest relative rate towards SN2 reaction.
NEET UG 2008 — Chemistry Organic Chemistry
2008mcqhard
In a SN2 substitution reaction of the type R−Br+Cl−⟶DMFR−Cl+Br−, which one of the following has the highest relative rate?
Official previous-year question
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
CH3−CH2−CH2Br
- B
- C
- D
CH3CH2Br
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