These are compounds which have a halogen bonded to a carbon atom somewhere in a molecule. While they are really useful compounds (particularly as organic solvents - they can help dissolve a large variety of compounds) they are not examined to a great extent on the L.C. course. Naming is important as is the formation of them using the two methods described in the mechanism section. A very useful reaction known as nucleophilic substitution is not covered on the L.C. course.
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