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Chlorotoluene is a group of three isomeric chemical compounds. They (ortho-chlorotoluene, meta-chlorotoluene, and para-chlorotoluene) consist of a disubstituted benzene ring with one chlorine atom and one methyl group.

Chemical properties[edit]

The isomers differ in the location of the chlorine, but have the same chemical formula. All have very similar boiling points, although p-chlorotoluene has a much higher melting point due to a more tightly-packed crystal structure.

Chlorotoluene Isomers
Common name o-chlorotoluene m-chlorotoluene p-chlorotoluene
Structure O-Chlortoluol.svg M-Chlortoluol.svg P-Chlortoluol.svg
Systematic name 1-chloro-2-methylbenzene 1-chloro-3-methylbenzene 1-chloro-4-methylbenzene
Molecular formula C7H7Cl (C6H4ClCH3)
Molar mass 126.586 g/mol
Appearance clear, colorless liquid
CAS number [95-49-8] [108-41-8] [106-43-4]
Density and phase 1.073 g/mL, liquid 1.072 g/mL, liquid 1.069 g/mL, liquid
Solubility in water practically insoluble
Other solubilities Soluble in non-polar solvents such as aromatic hydrocarbons
Melting point −35 °C (−31 °F; 238 K) −47 °C (−52.6 °F; 226 K) 7 °C (44.6 °F; 280 K)
Boiling point 159 °C (318.2 °F; 432 K) 162 °C (323.6 °F; 435 K) 162 °C (323.6 °F; 435 K)
Magnetic Susceptibility -81.98 x 10−6 cm3/mol -80.07 x 10−6 cm3/mol -80.07 x 10−6 cm3/mol

Benzyl chloride is an isomer, which has a chlorine substituted for one of the hydrogens of toluene's methyl group, and it is sometimes named α-chlorotoluene.