The following reaction method is not suitable for the preparation of the corresponding haloarene products,…
The following reaction method
is not suitable for the preparation of the corresponding haloarene products, due to high reactivity of halogen, when X is :
F
I
Cl
Br
Solution
- Aryl chlorides and bromides can easily be prepared by electrophilic substitution of arenes (toluene) with $\mathrm{Cl}_2$ and $\mathrm{Br}_2$ respectively in the presence of Lewis acid catalyst ( Fe in dark).
- Reaction with $\mathrm{I}_2$ is reversible and requires the presence of oxidising agent.
- Corresponding fluoroarene is not prepared by this method due to high reactivity of fluorine. Hence, ' X ' is $F$.
