The trend of halide nucleophilicity in polar protic solvents is $$\ce{I- > Br- > Cl- > F-}$$ The reasons given by Solomons and Fryhle[1], and by Wade[2] are basically as follows. Smaller anions are more solvated than bigger ones because of their 'charge to size ratio'. Thus, smaller ions are s...

The order of nucleophilicity for halide family in DMF is: $\ce{Cl- > Br- > I-}$. I understand the reason for this must be that DMF, being a polar aprotic solvent, is unable to solvate the halide ions. I was told by my teacher that this is true only for DMF and DMSO, while in other aprotic polar...

It seems to me that the level of voting on Physics SE is noticeably lower than on most other SE sites that I frequent and lower that it has been in the past (I have been a user on the site for several years). A casual look down the list of most recent questions shows that the vast majority are on...