1,2-Dichlorobenzene

1,2-Dichlorobenzene
Names
	Preferred IUPAC name 1,2-Dichlorobenzene
	Other names ortho-Dichlorobenzene, o-Dichlorobenzene, odcb, o-Dichlorobenzol
Identifiers
CAS Number	95-50-1 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:35290 ;
ChEMBL	ChEMBL298461 ;
ChemSpider	13837988 ;
ECHA InfoCard	100.002.206
EC Number	202-425-9;
KEGG	C14328 ;
PubChem CID	7239;
UNII	6PJ93I88XL ;
CompTox Dashboard (EPA)	DTXSID6020430 ;
	InChI InChI=1S/C6H4Cl2/c7-5-3-1-2-4-6(5)8/h1-4H Key: RFFLAFLAYFXFSW-UHFFFAOYSA-N ; InChI=1/C6H4Cl2/c7-5-3-1-2-4-6(5)8/h1-4H Key: RFFLAFLAYFXFSW-UHFFFAOYAE;
	SMILES c1ccc(c(c1)Cl)Cl; c1ccc(c(c1)Cl)Cl;
Properties
Chemical formula	C6H4Cl2
Molar mass	147.01 g/mol
Appearance	colourless liquid
Odor	Naphthalene-like
Density	1.30 g/cm3
Melting point	−17.03 °C (1.35 °F; 256.12 K)
Boiling point	180.19 °C (356.34 °F; 453.34 K)
Solubility in water	0.01%
Vapor pressure	1 mmHg (20°C)
Magnetic susceptibility (χ)	−84.26·10−6 cm3/mol
Refractive index (nD)	1.54920
Viscosity	1.0656 (20 °C)
Hazards
	Occupational safety and health (OHS/OSH):
Ingestion hazards	Mildly toxic
Inhalation hazards	Causes respiratory tract irritation
Eye hazards	Causes eye irritation
Skin hazards	Causes skin irritation
Flash point	66 °C (151 °F; 339 K)
Explosive limits	2.2%–9.2%
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	500 mg/kg (oral, rat, rabbit); 200 mg/kg (oral, guinea pig); 436 mg/kg (oral, mouse)
LCLo (lowest published)	1000 ppm (guinea pig, 20 hr); 800 ppm (guinea pig, 24 hr); 821 ppm (rat, 7 hr)
	NIOSH (US health exposure limits):
PEL (Permissible)	C 50 ppm (300 mg/m3)
REL (Recommended)	C 50 ppm (300 mg/m3)
IDLH (Immediate danger)	200 ppm
Safety data sheet (SDS)	External MSDS
Related compounds
Related compounds	1,2-Difluorobenzene; 1,2-Dibromobenzene
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

1,2-Dichlorobenzene, or orthodichlorobenzene (ODCB), is an aryl chloride and isomer of dichlorobenzene with the formula C₆H₄Cl₂. This colourless liquid is poorly soluble in water but miscible with most organic solvents. It is a derivative of benzene, substituted with two adjacent chlorine atoms.

It is mainly used as a precursor chemical in the synthesis of agrochemicals, as a preferred solvent for dissolving and working with fullerenes, as an insecticide, and in softening and removing carbon-based contamination on metal surfaces.