1. The problem statement, all variables and given/known data I'm trying to assign the spots for a TLC plate that I did in lab. http://imageshack.us/f/27/tlcpolar.png/ What is the order of polarity of these three molecules? 2. Relevant equations The more polar something is, the lower it will stay on a TLC plate. The less polar it is, the further it will travel up. 3. The attempt at a solution I have three spots on my plate, I'm trying to figure out what is what. I think that 3 is the most polar because of the OH groups and the fact that it forms B- in solution with another reactant that is in there. I just don't know about 1 and 2. Br is electronegative, but I don't know if this decreases the polarity because it is para to a group with an electronegative oxygen, or if it increases the polarity (compared to the phenyl ring).