In common name system, gem-dihalides are
named as alkylidene halides and vic-dihalides are named as alkylene
dihalides In IUPAC system, they are named as dihaloalkanes Structure
Common name
IUPAC name
CH3CH2CH(Cl)CH3
sec-Butyl chloride
2-Chlorobutane
(CH3)3CCH2Br
neo-Pentyl bromide
1-Bromo-2,2-dimethylpropane
(CH3)3CBr
tert-Butyl bromide
2-Bromo-2-methylpropane
CH2 = CHCl
Vinyl chloride
Chloroethene
CH2 = CHCH2Br
Allyl bromide
3-Bromopropene
CH2Cl2
Methylene chloride
Dichloromethane
CHCl3
Chloroform
Trichloromethane
CHBr3
Bromoform
Tribromomethane
CCl4
Carbon tetrachloride Tetrachloromethane
CH3CH2CH2F
n-Propyl fluoride
1-Fluoropropane
o-Chlorotoluene
1-Chloro-2-methylbenzene
or
2-Chlorotoluene
Benzyl chloride
Chlorophenylmethane
Table 6 1: Common and IUPAC Names of some Halides
Example 6