Identify the region of the electromagnetic spectrum used in \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectroscopy.

Identify which of these two techniques involves higher energy radiation.

radiowaves;

IR / infrared;

Candidates had few problems in (a), but although the correct selection of HCl was usually made in (b), many lost a mark as they did not refer to the change of dipole during the absorption of IR radiation.

Candidates had few problems in (a), but although the correct selection of HCl was usually made in (b), many lost a mark as they did not refer to the change of dipole during the absorption of IR radiation.