# List of compounds with carbon number 2

This is a partial list of molecules that contain 2 carbon atoms.
| Chemical formula | Synonyms | CAS number |
| C$_2$Al | monoaluminum dicarbide | 37297-57-7 |
| C$_2$Al$_2$ | dialuminum dicarbide | 12122-01-9 |
| C$_2$B | boron dicarbide | 12539-98-9 |
| C$_2$Be | beryllium dicarbide | 12070-28-9 |
| C$_2$BrCl | bromochloroacetylene | 25604-70-0 |
| C$_2$BrClF$_2$O | bromodifluoroacetylchloride | 3832-48-2 |
| C$_2$BrCl$_5$ | bromopentachloroethane | 79504-02-2 |
| C$_2$BrF$_5$ | bromopentafluoroethane | 354-55-2 |
| C$_2$Br$_2$FN | dibromo fluoroacetonitrile | 6698-74-4 |
| C$_2$Br$_2$N$_2$O$_2$ | dibromofuroxan | 70134-71-3 |
| C$_2$Br$_2$O$_2$ | oxalyl bromide | 15219-34-8 |
| C$_2$Br$_6$ | hexabromoethane | 594-73-0 |
| C$_2$Ca | calcium carbide | 75-20-7 |
| C$_2$Ce | cerium dicarbide | 12012-32-7 |
| C$_2$CeRh | cerium rhodium dicarbide | 53262-56-9 |
| C$_2$Cl$_2$F$_2$ | dichlorodifluoroethylene | 27156-03-2 |
| C$_2$Cl$_2$O$_2$ | oxalyl chloride | 79-37-8 |
| C$_2$Cl$_3$N | trichloroacetonitrile | 108-77-0 |
| C$_2$Cl$_4$ | tetrachloroethylene | 127-18-4 |
| C$_2$Cl$_4$O | trichloroacetyl chloride | 76-02-8 |
| C$_2$Cl$_4$O$_2$ | trichloromethyl chloroformate | 503-38-8 |
| C$_2$Cl$_5$F | pentachlorofluoroethane | 354-56-3 |
| C$_2$CoNO$_3$ | cobalt dicarbonyl nitrosyl | 61332-94-3 |
| C$_2$Dy | dysprosium dicarbide | 12175-80-3 |
| C$_2$Er | erbium dicarbide | 12192-37-9 |
| C$_2$Eu | europium dicarbide | 12127-44-5 |
| C$_2$FN$_5$O$_{10}$ | fluoropentanitroethane | 23072-51-7 |
| C$_2$F$_2$O$_2$ | oxalyl fluoride | 359-40-0 |
| C$_2$F$_3$ | trifluorovinyl radical | 4605-17-8 |
| C$_2$F$_3$I | iodotrifluoroethylene | 359-37-5 |
| C$_2$F$_3$N | trifluoromethylisocyanide | 105879-13-8 |
| C$_2$F$_5$ | pentafluoro ethyl radical | 3369-48-0 |
| C$_2$F$_5$I | pentafluoroethyliodide | 354-64-3 |
| C$_2$F$_6$O$_5$S$_2$ | trifluoromethanesulfonic anhydride | 358-23-6 |
| C$_2$F$_7$N | perfluoroethanamine | 354-80-3 |
| C$_2$H | ethynyl radical | 2122-48-7 |
| C$_2$HBrClF$_3$ | halothane | 151-67-7 |
| C$_2$HBrO | bromoketene | 78957-22-9 |
| C$_2$HBr$_2$FO$_2$ | dibromofluoroacetic acid | 353-99-1 |
| C$_2$HBr$_3$ | tribromoethene | 598-16-3 |
| C$_2$HBr$_3$O$_2$ | tribromoacetic acid | 75-96-7 |
| C$_2$HClO | chloroketene | 29804-89-5 |
| C$_2$HCl$_3$ | trichloroethylene | 79-01-6 |
| C$_2$HCl$_3$O | chloral | 75-87-6 |
| C$_2$HF$_3$OS | trifluorothiolacetic acid | 2925-25-9 |
| C$_2$HF$_5$O | pentafluorodimethyl ether | 3822-68-2 |
| C$_2$HNO | formyl cyanide | 4471-47-0 |
| C$_2$HO | ethynyloxy radical | 51095-15-9 |
| C$_2$H$_2$ | acetylene | 74-86-2 |
| C$_2$H$_2$AsCl$_3$ | lewisite | 541-25-3 |
| C$_2$H$_2$BrClO | bromoacetyl chloride | 22118-09-8 |
| C$_2$H$_2$Br$_2$O | bromoacetyl bromide | 598-21-0 |
| C$_2$H$_2$Br$_2$O$_2$ | dibromoethanoic acid | 631-64-1 |
| C$_2$H$_2$Cl$_2$ | dichloromethane | |
| C$_2$H$_2$ClF$_2$NO | chlorodifluoroacetamide | 354-28-9 |
| C$_2$H$_2$ClNS | chloromethyl thiocyanate | 3268-79-9 |
| C$_2$H$_2$Cl$_2$O | dichloroacetaldehyde | 79-02-7 |
| C$_2$H$_2$FN | fluoroacetonitrile | 503-20-8 |
| C$_2$H$_2$F$_2$O$_2$ | difluoroacetic acid | 381-73-7 |
| C$_2$H$_2$IN | iodoacetonitrile | 624-75-9 |
| C$_2$H$_2$N | cyanomethyl radical | 2932-82-3 |
| C$_2$H$_2$O | ethynol | 32038-79-2 |
| C$_2$H$_2$O | ketene | 463-51-4 |
| C$_2$H$_2$O | oxirene | 157-18-6 |
| C$_2$H$_2$OS | ethynesulfenic acid | 121564-25-8 |
| C$_2$H$_2$O$_2$ | glyoxal | 107-22-2 |
| C$_2$H$_2$O$_3$ | formic acid anhydride | 1558-67-4 |
| C$_2$H$_2$O$_4$ | oxalic acid | 144-62-7 |
| C$_2$H$_2$O$_8$Pb$_3$ | basic lead carbonate | 1319-46-6 |
| C$_2$H$_2$S | thioketene | 18282-77-4 |
| C$_2$H$_2$Se | selenoketene | 61134-37-0 |
| C$_2$H$_3$ | vinyl radical | 2669-89-8 |
| C$_2$H$_3$BF$_2$ | vinyldifluoroborane | 358-95-2 |
| C$_2$H$_3$BrO | acetyl bromide | 506-96-7 |
| C$_2$H$_3$Br$_3$O$_2$ | bromal hydrate | 507-42-6 |
| C$_2$H$_3$Cl | methylchlorocarbene | 31304-51-5 |
| C$_2$H$_3$ClO | acetyl chloride | 75-36-5 |
| C$_2$H$_3$ClO$_2$S | methoxycarbonylsulfenyl chloride | 26555-40-8 |
| C$_2$H$_3$Cl$_3$O$_2$ | chloral hydrate | 302-17-0 |
| C$_2$H$_3$FO | acetyl fluoride | 557-99-3 |
| C$_2$H$_3$F$_2$NO | difluoroacetamide | 359-38-6 |
| C$_2$H$_3$F$_3$O$_2$Si | silyl trifluoroacetate | 6876-44-4 |
| C$_2$H$_3$F$_3$S$_2$ | methyl trifluoromethyl disulfide | 14410-21-0 |
| C$_2$H$_3$IO | acetyl iodide | 507-02-8 |
| C$_2$H$_3$KO$_2$ | potassium acetate | 127-08-2 |
| C$_2$H$_3$N | acetonitrile | 75-05-8 |
| C$_2$H$_3$NO | methylcyanate | 1768-34-9 |
| C$_2$H$_3$NO | nitrosoethylene | 54680-52-3 |
| C$_2$H$_3$NO$_2$ | nitroethene | 500016-67-1 |
| C$_2$H$_3$NO$_2$ | nitroethylene | 3638-64-0 |
| C$_2$H$_3$NO$_3$ | oxamic acid | 471-47-6 |
| C$_2$H$_3$NO$_4$ | acetyl nitrate | 591-09-3 |
| C$_2$H$_3$NSe | methyl isoselenocyanate | 4426-70-4 |
| C$_2$H$_3$NSe | methyl selenocyanate | 2179-80-8 |
| C$_2$H$_3$NaO$_2$ | sodium ethanoate | 127-09-3 |
| C$_2$H$_3$O | acetyl radical | 3170-69-2 |
| C$_2$H$_3$O | oxiranyl radical | 31586-84-2 |
| C$_2$H$_3$O | vinyloxy radical | 6912-06-7 |
| C$_2$H$_3$O$_2$Tl | thallium acetate | 563-68-8 |
| C$_2$H$_4$ | ethylene | 74-85-1 |
| C$_2$H$_4$ClO$_2$P | ethylene chlorophosphite | 822-39-9 |
| C$_2$H$_4$Cl$_2$ | dichloroethane | 1300-21-6 |
| C$_2$H$_4$F$_2$O | difluoroethanol | 359-13-7 |
| C$_2$H$_4$N$_2$O$_2$ | oxalamide | 471-46-5 |
| C$_2$H$_4$N$_2$O$_4$ | dihydroxyglyoxime | 1687-60-1 |
| C$_2$H$_4$N$_2$S$_2$ | ethanedithioamide | 79-40-3 |
| C$_2$H$_4$N$_4$ | dicyanodiamide | 461-58-5 |
| C$_2$H$_4$N$_4$O$_2$ | diazenedicarboxamide | 123-77-3 |
| C$_2$H$_4$O | acetaldehyde | 75-07-0 |
| C$_2$H$_4$O | ethenol | 557-75-5 |
| C$_2$H$_4$O | ethylene oxide | 75-21-8 |
| C$_2$H$_4$OS | ethanethioic acid | 507-09-5 |
| C$_2$H$_4$OS | ethenesulfenic acid | 2492-74-2 |
| C$_2$H$_4$O$_2$ | acetic acid | 64-19-7 |
| C$_2$H$_4$O$_2$ | 1,2-dioxetane | 6788-84-7 |
| C$_2$H$_4$O$_2$ | formaldehyde dimer | 61233-19-0 |
| C$_2$H$_4$O$_2$ | methyl formate | 107-31-3 |
| C$_2$H$_4$O$_2$ | glycolaldehyde | 141-46-8 |
| C$_2$H$_4$O$_3$ | ethaneperoxoic acid | 79-21-0 |
| C$_2$H$_4$O$_3$ | monomethyl carbonate | 7456-87-3 |
| C$_2$H$_4$O$_4$ | formic acid dimer | 14523-98-9 |
| C$_2$H$_4$S | thiirane | 420-12-2 |
| C$_2$H$_4$S | thioacetaldehyde | 6851-93-0 |
| C$_2$H$_4$Se | selenoacetaldehyde | 67281-48-5 |
| C$_2$H$_4$Se$_3$ | triselenothane | 121400-83-7 |
| C$_2$H$_5$ | ethyl radical | 2025-56-1 |
| C$_2$H$_5$BCl$_2$ | ethyldichloroborane | 1739-53-3 |
| C$_2$H$_5$BF$_2$ | ethylidifluoroborane | 430-41-1 |
| C$_2$H$_5$BrHg | ethylmercuric bromide | 107-26-6 |
| C$_2$H$_6$Hg | dimethylmercury | 593-74-8 |
| C$_2$H$_5$BrO | bromomethyl methyl ether | 13057-17-5 |
| C$_2$H$_5$Cl | ethyl chloride | 75-00-3 |
| C$_2$H$_5$ClN$_2$O | chloroacetyl hydrazine | 30956-28-6 |
| C$_2$H$_5$ClO | ethyl hypochlorite | 624-85-1 |
| C$_2$H$_5$ClO$_2$S | ethanesulfonyl chloride | 594-44-5 |
| C$_2$H$_5$ClS | chloromethylmethyl sulfide | 2373-51-5 |
| C$_2$H$_5$Cl$_2$O$_2$P | ethyl dichlorophosphate | 1498-51-7 |
| C$_2$H$_5$Cl$_2$P | ethyldichlorophosphine | 1498-40-4 |
| C$_2$H$_5$Cl$_2$PSe | ethylphosphonoselenoic dichloride | 14705-46-5 |
| C$_2$H$_5$Cl$_3$Si | ethyltrichlorosilane | 115-21-9 |
| C$_2$H$_5$FO | methoxymethyl fluoride | 460-22-0 |
| C$_2$H$_5$FO$_2$S | ethane sulfonyl fluoride | 754-03-0 |
| C$_2$H$_5$HgI | ethylmercuric iodide | 2440-42-8 |
| C$_2$H$_5$I | iodoethane | 75-03-6 |
| C$_2$H$_5$IO | iodomethyl methyl ether | 13057-19-7 |
| C$_2$H$_5$IS | iodomethyl methyl sulfide | 43034-68-0 |
| C$_2$H$_5$Li | ethyl lithium | 811-49-4 |
| C$_2$H$_5$N | acetaldimine | 20729-41-3 |
| C$_2$H$_5$N | ethenamine | 593-67-9 |
| C$_2$H$_5$N | ethylenimine | 151-56-4 |
| C$_2$H$_5$NO | acetaldoxime | 107-29-9 |
| C$_2$H$_5$NO | acetamide | 60-35-5 |
| C$_2$H$_5$NO | nitrosoethane | 925-91-7 |
| C$_2$H$_5$NOS | aminothioacetic acid | 758-10-1 |
| C$_2$H$_5$NO$_2$ | glycine | 56-40-6 |
| C$_2$H$_5$NO$_2$ | glycolamide | 598-42-5 |
| C$_2$H$_5$NO$_2$S | vinylsulfonamide | 2386-58-5 |
| C$_2$H$_5$NO$_4$ | ammonium acid oxalate | 5972-72-5 |
| C$_2$H$_5$NS | ethanethioamide | 62-55-5 |
| C$_2$H$_5$N$_3$O$_2$ | imidodicarbonic diamide | 108-19-0 |
| C$_2$H$_5$O | ethoxy radical | 2154-50-9 |
| C$_2$H$_5$P | phosphirane | 6569-82-0 |
| C$_2$H$_5$P | vinyl phosphine | 58436-39-8 |
| C$_2$H$_5$PS$_2$ | phosphenodithioic ethane | 41391-49-5 |
| C$_2$H$_5$S | methylthiomethyl radical | 31533-72-9 |
| C$_2$H$_6$ | ethane | 74-84-0 |
| C$_2$H$_6$AlCl | dimethylaluminum chloride | 1184-58-3 |
| C$_2$H$_6$AsBr | dimethylarsine bromide | 676-71-1 |
| C$_2$H$_6$AsCl | chlorodimethylarsine | 557-89-1 |
| C$_2$H$_6$BBr | dimethylboron bromide | 5158-50-9 |
| C$_2$H$_6$BCl | chlorodimethylborane | 1803-36-7 |
| C$_2$H$_6$BClFN | dimethylaminofluorochloroborane | 38481-07-1 |
| C$_2$H$_6$BClO$_2$ | chlorodimethoxyborane | 868-81-5 |
| C$_2$H$_6$BFO$_2$ | fluorodimethoxyborane | 367-46-4 |
| C$_2$H$_6$Be | dimethylberyllium | 506-63-8 |
| C$_2$H$_6$ClOP | dimethylphosphinic chloride | 1111-92-8 |
| C$_2$H$_6$ClO$_2$P | dimethylchlorophosphite | 3743-07-5 |
| C$_2$H$_6$ClPS | dimethylphosphinothioic chloride | 993-12-4 |
| C$_2$H$_6$Cl$_2$Ge | dimethylgermanium dichloride | 1529-48-2 |
| C$_2$H$_6$Cl$_2$Si | ethyldichlorosilane | 1789-58-8 |
| C$_2$H$_6$FO$_2$P | methyl methylphosphonofluoridate | 353-88-8 |
| C$_2$H$_6$FP | dimethyl fluorophosphine | 507-15-3 |
| C$_2$H$_6$F$_3$NS | dimethylaminosulfur trifluoride | 3880-03-3 |
| C$_2$H$_6$GeO | dimethylgermanone | 5061-27-8 |
| C$_2$H$_6$GeS | dimethylgermathione | 16090-49-6 |
| C$_2$H$_6$N | dimethyl amidogen | 15337-44-7 |
| C$_2$H$_6$N$_2$O$_2$ | ethylnitramine | 19091-98-6 |
| C$_2$H$_6$N$_2$O$_4$ | hydrazinium hydrogen oxalate | 20321-02-2 |
| C$_2$H$_6$O | dimethyl ether | 115-10-6 |
| C$_2$H$_6$O | ethanol | 64-17-5 |
| C$_2$H$_6$OS | dimethyl sulfoxide | 67-68-5 |
| C$_2$H$_6$OS$_2$ | methyl methanethiosulfinate | 13882-12-7 |
| C$_2$H$_6$O$_2$ | ethyl hydroperoxide | 3031-74-1 |
| C$_2$H$_6$O$_2$ | ethylene glycol | 107-21-1 |
| C$_2$H$_6$O$_2$S | dimethyl sulfone | 67-71-0 |
| C$_2$H$_6$O$_2$S$_2$ | methyl methanethiosulfonate | 2949-92-0 |
| C$_2$H$_6$O$_4$ | dioxybismethanol | 17088-73-2 |
| C$_2$H$_6$O$_5$S$_2$ | methanesulfonic anhydride | 7143-01-3 |
| C$_2$H$_6$S | dimethyl sulfide | 75-18-3 |
| C$_2$H$_6$S | ethanethiol | 75-08-1 |
| C$_2$H$_6$S$_5$ | dimethyl pentasulfide | 7330-31-6 |
| C$_2$H$_6$Se | dimethyl selenide | 593-79-3 |
| C$_2$H$_6$Se$_2$ | dimethyl diselenide | 7101-31-7 |
| C$_2$H$_6$Si$_2$ | disilyl acetylene | 1070-76-4 |
| C$_2$H$_6$Sn | dimethylstannylene radical | 23120-99-2 |
| C$_2$H$_6$Te | dimethyltelluride | 593-80-6 |
| C$_2$H$_6$Zn | dimethylzinc | 544-97-8 |
| C$_2$H$_7$As | dimethylarsine | 593-57-7 |
| C$_2$H$_7$AsO$_3$ | ethylarsonic acid | 507-32-4 |
| C$_2$H$_7$BF$_3$N | dimethylaminetrifluoroborane | 811-59-6 |
| C$_2$H$_7$BO$_2$ | ethyldihydroxyborane | 4433-63-0 |
| C$_2$H$_7$ClO | dimethyl ether hydrogen chloride complex | 24521-77-5 |
| C$_2$H$_7$N | ethylamine | 75-04-7 |
| C$_2$H$_7$NO | acetaldehyde ammonia trimer | 75-39-8 |
| C$_2$H$_7$NO | ethanolamine | 141-43-5 |
| C$_2$H$_7$NO$_2$S | ethanesulfonamide | 1520-70-3 |
| C$_2$H$_7$NO$_3$S | taurine | 91105-79-2 |
| C$_2$H$_7$NO$_4$S$_2$ | dimethane sulfonamide | 5347-82-0 |
| C$_2$H$_7$NS | mercaptamine | 60-23-1 |
| C$_2$H$_7$O$_3$P | ethylphosphonic acid | 15845-66-6 |
| C$_2$H$_8$BF$_4$N | dimethylammonium tetrafluoroborate | 16970-97-1 |
| C$_2$H$_8$BrN | ethylammoniumbromide | 593-55-5 |
| C$_2$H$_8$N$_2$ | ethylenediamine | 107-15-3 |
| C$_2$H$_8$N$_2$O$_4$ | ammonium oxalate | 1113-38-8 |
| C$_2$H$_8$O$_2$Si | dimethoxysilane | 5314-52-3 |
| C$_2$H$_9$N$_2$O$_3$ | ethylammonium nitrate | 22113-86-6 |
| C$_2$H$_{10}$N$_2$O$_8$S$_2$Fe | ferrous ethylenediammonium sulfate | 63589-59-3 |
| C$_2$H$_{12}$CdTe | dimethylcadmium·dimethyltellurium | 143481-66-7 |
| C$_2$H$_{12}$N$_6$O$_4$S | guanidine sulfate | 594-14-9 |
| C$_2$HgN$_2$S$_2$ | mercuric thiocyanate | 592-85-8 |
| C$_2$Ho | holmium dicarbide | 12071-14-6 |
| C$_2$K$_2$N$_2$ | potassium cyanide dimer | 55186-08-8 |
| C$_2$La | lanthanum dicarbide | 12071-15-7 |
| C$_2$Li$_2$ | lithium carbide | 1070-75-3 |
| C$_2$Lu | lutetium dicarbide | 12175-89-2 |
| C$_2$Mg | magnesium carbide | 12122-46-2 |
| C$_2$N$_2$ | bisisocyanide | 78800-21-2 |
| C$_2$N$_2$ | cyanogen | 460-19-5 |
| C$_2$N$_2$Na$_2$ | sodium cyanide | 55186-09-9 |
| C$_2$N$_2$O | cyanogen isocyanate | 22430-66-6 |
| C$_2$N$_2$S | cyanogen isothiocyanate | 56023-03-1 |
| C$_2$N$_2$S | sulfur dicyanide | 627-52-1 |
| C$_2$N$_2$S$_2$ | thiocyanogen | 505-14-6 |
| C$_2$N$_2$Se | selenium cyanide | 2180-01-0 |
| C$_2$N$_4$O$_6$ | trinitroacetonitrile | 630-72-8 |
| C$_2$N$_6$O$_{12}$ | hexanitroethane | 918-37-6 |
| C$_2$Na$_2$ | Sodium carbide | 2881-62-1 |
| C$_2$Na$_2$O$_4$ | sodium oxalate | 62-76-0 |
| C$_2$Nd | neodymium dicarbide | 12071-21-5 |
| C$_2$O | dicarbon monoxide | 12071-23-7 |
| C$_2$P | dicarbon phosphide | 12602-39-0 |
| C$_2$Rh | rhodium dicarbide | 37306-47-1 |
| C$_2$Sc | scandium dicarbide | 12175-91-6 |
| C$_2$Si | silicon dicarbide | 12071-27-1 |
| C$_2$Si$_2$ | disiladicarbide | 12144-09-1 |
| C$_2$Th | thorium dicarbide | 12071-31-7 |
| C$_2$Ti | titanium dicarbide | 12071-32-8 |
| C$_2$U | uranium dicarbide | 12071-33-9 |
| C$_2$V | vanadium dicarbide | 12542-39-1 |
| C$_2$Y | yttrium dicarbide | 12071-35-1 |
| C$_2$Zr | zirconium dicarbide | 12340-54-4 |