For those molecules find the number of different signals. We give you the molecular formula in order to guess what are the impurities.

In ¹H NMR spectroscopy we often have signals that are composed on many peaks (multiplet) and therefore based on the symmetry and the distance we need to try to guess where is a signal and how many there are.

In CDCl₃, water is around 1.5ppm and CHCl₃ at 7.27.

In DMSO-d₆, water is at around 3.5 and DMSO-d₅ at 2.5..