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| Characteristic group |
Prefix | Non-IUPAC class name |
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| -Br | Bromo | alkyl halide |
| -Cl | Chloro | alkyl halide |
| -ClO | Chlorosyl | |
| -ClO2 | Chloryl | |
| -ClO3 | Perchloryl | |
| -F | Fluoro | alkyl halide |
| -I | Iodo | alkyl halide |
| -IO | Iodosyl | |
| -IO2 | Iodyl | |
| =N2 | Diazo | diazoalkane |
| -N3 | Azido | azide |
| -NO | Nitroso | |
| -NO2 | Nitro | |
| -OR | R-oxy | ether |
| -SR | R-thio | sulfide |
Adapted from Sections A, B and C of IUPAC "Blue Book," Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.