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Complex organic molecules (COMs) have been observed to be abundant in the gasphase toward protostars. Deep line surveys have been carried out only for alimited number of well-known high-mass star forming regions using the AtacamaLarge Millimeter/submillimeter Array (ALMA), which has unprecedented resolutionand sensitivity. Statistical studies on oxygen-bearing COMs (O-COMs) inhigh-mass protostars using ALMA are still lacking. With the recent CoCCoAsurvey, we are able to determine the column density ratios of six O-COMs withrespect to methanol (CH$_3$OH) in a sample of 14 high-mass protostellar sourcesto investigate their origin through ice and/or gas-phase chemistry. Theselected species are: acetaldehyde (CH$_3$CHO), ethanol (C$_2$H$_5$OH),dimethyl ether (DME, CH$_3$OCH$_3$), methyl formate (MF, CH$_3$OCHO),glycolaldehyde (GA, CH$_2$OHCHO), and ethylene glycol (EG, (CH$_2$OH)$_2$). DMEand MF have the highest and most constant ratios within one order of magnitude,while the other four species have lower ratios and exhibit larger scatter by1-2 orders of magnitude. We compare the O-COM ratios of high-mass CoCCoAsources with those of 5 low-mass protostars available from the literature,along with the results from experiments and simulations. We find that the O-COMratios with respect to methanol are on the same level in both the high- andlow-mass samples, which suggests that these species are mainly formed insimilar environments during star formation, probably in ice mantles on dustgrains during early pre-stellar stages. Current simulations and experiments canreproduce most observational trends with a few exceptions, and hypotheses existto explain the differences between observations and simulations/experiments,such as the involvement of gas-phase chemistry and different emitting areas ofmolecules.

CoCCoA: Complex Chemistry in hot Cores with ALMA. Selected oxygen-bearing species