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Chloromethane, also called methyl chloride, Refrigerant-40, R-40 or HCC 40, is an organic compound with the chemical formula CH 3 Cl. One of the haloalkanes , it is a colorless, sweet-smelling, flammable gas.
81.2 J/(mol K) at 15 °C Gas properties Std enthalpy change of formation, Δ f H o gas –83.68 kJ/mol Standard molar entropy, S o gas: 234.36 J/(mol K) at 100 kPa Enthalpy of combustion, Δ c H o gas –764.0 kJ/mol Heat capacity, c p: 40.70 J/(mol K) at 25 °C van der Waals' constants [6] a = 757.0 L 2 kPa/mol 2 b = 0.06483 liter per mole
[1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [ 4 ] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
Structure of the chloromethyl group. In organic chemistry, the chloromethyl group is a functional group that has the chemical formula −CH 2 −Cl. The naming of this group is derived from the methyl group (which has the formula −CH 3), by replacing one hydrogen atom by a chlorine atom. Compounds with this group are a subclass of the ...
The four common [a] members are fluoromethane, chloromethane, bromomethane and iodomethane. Historical name for this group is methyl halides ; it's still widely used. The compounds of this class are often described as CH 3 X or MeX (X - any halogen, Me - methyl group ).
DCM is produced by treating either chloromethane or methane with chlorine gas at 400–500 °C. At these temperatures, both methane and chloromethane undergo a series of reactions producing progressively more chlorinated products. In this way, an estimated 400,000 tons were produced in the US, Europe, and Japan in 1993. [12] CH 4 + Cl 2 → CH ...
Using CH 4 in large excess generates primarily CH 3 Cl and using Cl 2 in large excess generates primarily CCl 4, but mixtures of other products will still be present. Halogenation of methanol. This method is used for the production of the mono-chloride, -bromide, and -iodide. CH 3 OH + HCl → CH 3 Cl + H 2 O 4 CH 3 OH + 3 Br 2 + S → 4 CH 3 ...
Other products such as CH 2 Cl 2 may also form. Chain termination Two free radicals (chlorine and chlorine, chlorine and methyl, or methyl and methyl) combine: Methane chlorination: termination The last possibility generates in an impurity in the final mixture (notably, an organic molecule with a longer carbon chain than the reactants).