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Understanding the degree of chemical complexity that can be reached instar-forming regions, together with the identification of precursors of thebuilding blocks of life in the interstellar medium, is one of the goals ofastrochemistry. Unbiased spectral surveys with large bandwidth and highspectral resolution are thus needed, to resolve line blending in chemicallyrich sources and identify complex organic molecules. This kind of observationshas been successfully carried out, mainly towards the Galactic Center, a regionthat shows peculiar environmental conditions. We present an unbiased spectralsurvey at 3mm of one of the most chemically rich hot molecular cores locatedoutside the Galactic Center, in the high-mass star-forming region G31.41+0.31.In this first paper, we present the survey and discuss the detection of the 3isomers of C$_{2}$H$_{4}$O$_{2}$: methyl formate, glycolaldehyde and aceticacid. Observations were carried out with ALMA and cover the entire Band 3 from84 to 116 GHz with an angular resolution of $1.2^{''}$x$1.2^{''}$ and aspectral resolution of $\sim0.488$ MHz. The transitions of the 3 molecules havebeen analyzed with the software XCLASS. All three isomers were detected andmethyl formate and acetic acid abundances in G31 are the highest detected up tonow, if compared to sources in literature. The size of the emission variesamong the three isomers with acetic acid showing the most compact emissionwhile methyl formate the most extended. The comparison with chemical modelssuggests the necessity of grain-surface routes for the formation of methylformate in G31, while for glycolaldehyde both scenarios could be feasible.Proposed grain-surface reaction for acetic acid is not able to reproduce theobserved abundance in this work, while gas-phase scenario should be furthertested due to large uncertainties.

The GUAPOS project: G31.41+0.31 Unbiased ALMA sPectral Observational Survey -- I. Isomers of C$_{2}$H$_{4}$O$_{2}$