In $\mathrm{S}_{\mathrm{N}} 2$ substitution reaction of the type $R-\mathrm{Br}+\mathrm{Cl}^{-}…
In $\mathrm{S}_{\mathrm{N}} 2$ substitution reaction of the type
$R-\mathrm{Br}+\mathrm{Cl}^{-} \xrightarrow[\mathrm{BMF}]{ } R-\mathrm{Cl}+\mathrm{Br}^{-}$
Which one of the following has highest relative rate?
The rate of $S_n 2$ reaction is the maximum with $1^{\circ}$ allyl halide having least steric hindrance. Out of
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$ and $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$ has the least steric hindrance and hence has the highest relative rate.
