Chemical shift is a measure of the extent to which a signal's frequency differs from that of a reference compound. A proton's chemical shift is governed largely by the idenity of the surrounding atoms. Match the molecules below with the expected chemical shift of the methyl group protons:

H3CCH3 FC Categories 0.9ppm 2.1ppm 3.3ppm 4.1ppm CH3 HOCH3 FCH3 Categories