How to tell acidity of compounds (1 Viewer)

[C2H6O]

I had a chem topic test today for mod 7 organic chem and one of the questions was which of the following is most basic? CH3CH2COOH, CH3CH2OH, CH3CH2CONH2, or CH3CH2CH2NH2 (basically carboxylic acid vs alcohol vs amide vs amine). We haven't done mod 5 or 6 yet so I don't really know what constitutes as basic or acidic and how to determine it? Can anyone help? (answer was the amide I think or might've been the amine)

 

[wizzkids]

If you are doing the modules out of order, and you studied the content for module 7 before doing mods 5 and 6 then you are going to get confused for sure.
There are three models for acids and bases that we study, Arrhenius, Bronsted-Lowry and Lewis. You really need a good understanding of these three models plus reversible equilibria to answer a question about comparing carboxylic acid vs alcohol vs amide vs amine. Or else you just have to memorise by rote learning which is pointless (btw, the correct answer is amine is the most basic).