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Production and uses- 1,2-Dichlorobenzene is obtained as a side-product of the production of chlorobenzene: C 6H 5Cl + Cl 2 → C 6H 4Cl 2 + HCl The reaction also affords the 1,4- and small amounts of the 1,3-isomer. The 1,4- isomer is preferred over the 1,2- isomer due to steric hindrance. The 1,3- isomer is uncommon because it is a meta- compound, while chlorine, like all halogens, is a ortho/para- directors in terms of electrophilic aromatic substitution. It is mainly used as a precursor to 1