In S_ N 2 substitution reaction of the type R-Br+Cl^ - [BMF]...

\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? In S_ N 2 substitution reaction of the type R-Br+Cl^ - [BMF] R-Cl+Br^ - Which one of the following has highest relative

In S_ N 2 substitution reaction of the type R-Br+Cl^ - [BMF] R-Cl+Br^ - Which one of the following has highest relative

Options

A
B
C $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$
D $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}$

Correct answer

C. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$

Step-by-step solution

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.

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