The IUPAC name of the compound CH3-CH2-CH2-OH is

The chain has three carbons, so the parent name is propane, and the hydroxyl group at the end carbon gives the suffix -ol with the locant 1: propan-1-ol. The suffix -al indicates an aldehyde group and -oic acid a carboxylic group, which are different functional groups. Ethanol has only two carbons. Counting carbons and recognising the group is the key to this question.