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