Taken together, this explains why M31 exhibited a "fake" increase which could mislead further analysis on the CORR mechanism. For example, if not careful enough and not taking Chem-I scrambling into consideration, one may think ethanol was produced on Pt from CORR when noting that the IM31 increased. However, fundamentally this reaction cannot happen. This is because *CO binds on Pt so strongly that poisons the surface, and thus disables C-C bond to form, which is the essential step of ethanol production , . In another scenario, if IM31 is noted during CORR on Cu, one would easily correlate the potential at which IM31 started to increase with the onset potential of ethanol formation, and thus distort the further investigations on the CORR mechanism based on this observation.