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In chemistry, methylene generally refers to a carbon atom bound to two hydrogen atoms. It may mean:
- Methylene radical or (unsubstituted) carbene, :CH2
- Methylene group or methylidene, a part of a molecule with formula =CH2, connected to another atom by a double bond, as in "methylenecyclopropene"
- Methylene bridge or methanediyl, -CH2-, with the carbon connected to two distinct atoms, as in "methylene dichloride"
Methylene may also be:
- An obsolete name for methanol, CH3OH.
- "Bichloride of methylene" (30% methanol and 70% chloroform), a variant of the old anesthetic A.C.E. mixture.
See also 
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