I am getting so frustrated by this section.. I can seriously barely answer any of these, let alone understand the explanations. My o-chem teacher never used any of these reagents (he's not very good) and it is showing. I am really good at EaS, Sn1,Sn2.. but all of these carboxylic acid deriv, carbonyl stuff and aldol cond. are killing me. I already watched chads, but might watch some of them again. Any suggestions? i thought this would be one of my stronger sections (A in both ochems) but i am seriously struggling.