Question

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

c. CH₃CH₂ CH₂OCH₃ CH₃CH₂ CH₂OTs CH₃CH₂ CH₂Br

Short answer

Answer

CH₃CH₂ CH₂OCH₃ < CH₃CH₂ CH₂ Br < CH₃CH₂ CH₂OTs

Step-by-step solution

SN2 reaction

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

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

Reactivity towards  SN2 reaction

As the reaction is single step reaction so, no intermediate is formed andS_N2 occur fast with primary alkane than secondary alkane.

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

OTs is one of the best leaving group then halogens are the good leaving group

So,

CH₃CH₂ CH₂OCH₃ < CH₃CH₂ CH₂ Br < CH₃CH₂ CH₂OTs

Reactivity order