Bitsat
Haloalkanes And Haloarenes
BITSAT 2024
MCQ+3 / -12024
In $ S_{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?