Fun. group formula → - X
Fun. group name → halide OR halo
Definition :
The aromatic compounds obtained by replacing one or more hydrogen atoms of aromatic hydrogen (Benzene) with equal number of halogen atoms called halo arenes.
Nomenclature of Mono halo arenes :
1. Common name system :
I) The mono halo arenes are called Aryl halides.
II) The mono halogen derivatives of benzene called phenyl halides.
III) Use the prefixes ortho (o), meta (m) & para (p) whenever needed.
2. IUPAC name system :
I) Convert halogen as halo.
II) Give the name of parent aromatic hydrogen carbon.
III) Thus it becomes halo arenes (haloarenes).
IV) Give numbering from principle functional group. (-X)
| SL. No | Formula | Common name | IUPAC name | ||
| 1 |  |
PhenylChloride | chlorobenzene | ||
| 2 |  |
PhenylBromode | bromobenzene | ||
| 3 |  |
PhenylIodide | iodobenzene | ||
| 4 |  |
o-chlorotoluene | 2-cholotoluene OR 1−chloro−2−methylbenzene |
||
| 5 |  |
p-chlorotoluene | 4-chlorotoluene OR 1-choloro-4-methylbenzene |