Q57b - Organic Chemistry (Mcmurry)

Question

Question: Order each of the following sets of compounds with respect to reactivity:

b.

Step-by-Step Solution

Answer

Answer

Step1: S N 2 reaction

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

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

Step2: Reactivity towards S N 2 reaction

As the reaction is the single-step reaction so, no intermediate is formed and occur fast with primary alkane than with secondary alkane.

 S_N2 occur fast with those reacting species which have best leaving group 

 S_N2 occur fast when less steric hindrance occurs because if the steric hindrances more then reactivity get decrease.

So, 

                                            Reactivity order