Question: The organic compound with formula C3H8O2 is mainly used as a what that can can be formed by the nucleophilic attack of methanol on a  colorless and flammable gas with a faintly sweet odor?

Context paragraphs:
Trimethylamine: Trimethylamine (TMA) is an organic compound with the formula N(CH).  This colorless, hygroscopic, and flammable tertiary amine has a strong "fishy" odor in low concentrations and an ammonia-like odor at higher concentrations.  It is a gas at room temperature but is usually sold in pressurized gas cylinders or as a 40% solution in water.  TMA is a nitrogenous base and can be readily protonated to give trimethylammonium cation.  Trimethylammonium chloride is a hygroscopic colorless solid prepared from hydrochloric acid.  Trimethylamine is a good nucleophile, and this reaction is the basis of most of its applications.

2-Methoxyethanol: 2-Methoxyethanol, or methyl cellosolve, is an organic compound with formula C3H8O2 that is used mainly as a solvent.  It is a clear, colorless liquid with an ether-like odor.  It is in a class of solvents known as glycol ethers which are notable for their ability to dissolve a variety of different types of chemical compounds and for their miscibility with water and other solvents.  It can be formed by the nucleophilic attack of methanol on protonated oxirane followed by proton transfer:

Carbonyl sulfide: Carbonyl sulfide is the organic compound with the linear formula OCS.  Normally written as COS, it is a colourless flammable gas with an unpleasant odor.  It is a linear molecule consisting of a carbonyl group double bonded to a sulfur atom.  Carbonyl sulfide can be considered to be intermediate between carbon dioxide and carbon disulfide, both of which are valence isoelectronic with it.

Chloroethane: Chloroethane or monochloroethane, commonly known by its old name ethyl chloride, is a chemical compound with chemical formula C2H5Cl , once widely used in producing tetraethyllead, a gasoline additive.  It is a colorless, flammable gas or refrigerated liquid with a faintly sweet odor.

Dimethylamine: Dimethylamine is an organic compound with the formula (CH)NH.  This secondary amine is a colorless, flammable gas with an ammonia-like odor.  Dimethylamine is commonly encountered commercially as a solution in water at concentrations up to around 40%.  In 2005, an estimated 270,000 tons were produced industrially, but it is also found as a natural product.

Chloromethane: Chloromethane, also called methyl chloride, Refrigerant-40, R-40 or HCC 40, is a chemical compound of the group of organic compounds called haloalkanes.  It was once widely used as a refrigerant.  It is a colorless extremely flammable gas with a mildly sweet odor.  Due to concerns about its toxicity, it is no longer present in consumer products.

Propylene glycol: Propylene glycol, also called propane-1,2-diol, is a synthetic organic compound with the chemical formula CHO.  It is a viscous colorless liquid which is nearly odorless but possesses a faintly sweet taste.  Chemically it is classed as a diol and is miscible with a broad range of solvents, including water, acetone, and chloroform.

1,2-Dichloropropane: 1,2-Dichloropropane is an organic compound classified as a chlorocarbon.  It is a colorless, flammable liquid with a sweet odor.  it is obtained as a byproduct of the production of epichlorohydrin, which is produced on a large scale.

Ethylene oxide: Ethylene oxide, called oxirane by IUPAC, is an organic compound with the formula C2H4O .  It is a cyclic ether and the simplest epoxide: a three-membered ring consisting of one oxygen atom and two carbon atoms.  Ethylene oxide is a colorless and flammable gas with a faintly sweet odor.  Because it is a strained ring, ethylene oxide easily participates in a number of addition reactions that result in ring-opening.  Ethylene oxide is isomeric with acetaldehyde and with vinyl alcohol.  Ethylene oxide is industrially produced by oxidation of ethylene in the presence of silver catalyst.

Vinyl chloride: Vinyl chloride is an organochloride with the formula HC=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene.  This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).  About 13 billion kilograms are produced annually.  VCM is among the top twenty largest petrochemicals (petroleum-derived chemicals) in world production.  The United States currently remains the largest VCM manufacturing region because of its low-production-cost position in chlorine and ethylene raw materials.  China is also a large manufacturer and one of the largest consumers of VCM.  Vinyl chloride is a gas with a sweet odor.  It is highly toxic, flammable, and carcinogenic.  It can be formed in the environment when soil organisms break down "chlorinated" solvents.  Vinyl chloride that is released by industries or formed by the breakdown of other chlorinated chemicals can enter the air and drinking water supplies.  Vinyl chloride is a common contaminant found near landfills.  In the past VCM has been used as a refrigerant.

Supporting paragraphs: 2-Methoxyethanol Ethylene oxide
Answer: a solvent