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$$
\text { In a } \mathrm{S}_{\mathrm{N}} 2 \text { substitution reaction of the type }
$$
$$
\mathrm{R}-\mathrm{Br}+\mathrm{Cl}^{-} \stackrel{\mathrm{OMF}}{\longrightarrow} \mathrm{R}-\mathrm{Cl}+\mathrm{Br}^{-}
$$
Which one of the following has the highest relative rate?
Options:
\text { In a } \mathrm{S}_{\mathrm{N}} 2 \text { substitution reaction of the type }
$$
$$
\mathrm{R}-\mathrm{Br}+\mathrm{Cl}^{-} \stackrel{\mathrm{OMF}}{\longrightarrow} \mathrm{R}-\mathrm{Cl}+\mathrm{Br}^{-}
$$
Which one of the following has the highest relative rate?
- A $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$
- B $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2 \mathrm{Br}$
- C
- D
Solution:
2862 Upvotes
Verified Answer
The correct answer is:
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$
For $\mathrm{S}_{\mathrm{N} 2}$ reaction, there should be low steric hinderance for better reactivity.
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