organic chemistry:substitution reaction

jadelamlam

In substitution reaction between bromine and hexane, why the bromine should be in organic solvent? Bromine is already a liquid!

mycotheology

Good question. Maybe its because the homolysis can only take place in a solvent. Maybe the Br radicals are insoluble in Br₂.

jadelamlam

I just can't understand :(
Hexane can dissolve bromine.What would happen if we don't add Br into the organic solvent?
There will be no reaction?Or sth bad will happen?