44aE - Organic Chemistry (Mcmurry)

Question

What effect would you expect the following changes to have on the rate of the reaction of ethanol with 2-iodo-2-methyl butane?

 (a) The concentration of the halide is tripled.

Step-by-Step Solution

Answer

S N 2 reaction

It is a nucleophilic substitution reaction in which an old bond breaks is a break and a new bond is formed both processes occur simultaneously. Hence, it’s a single-step reaction.

The two reacting species are involved in the rate determining steps.

 

 

 

Rate of the reaction

In  $S_{N}2$ rate of the reaction depend on the reacting species and nucleophile.

Hence, on triple the concentration of halide the rate of the reaction get increases Hence, the rate become triple and the reaction becomes fast.

$\begin{array}{c}R\text{\hspace{0.33em}}=K\left(R.S\right)\left(N\right)\\ =K\left(3\right)\\ =3K\end{array}$