NMR spectra studies: -
      NMR spectroscopy is a physicochemical analysis technique based on the interaction of externally applied radiofrequency radiation with atomic nuclei.These NMR-active nuclei behave as tiny magnets (magnetic dipoles), capable of aligning with external magnetic fields (a process called magnetization).Only atomic nuclei with I != 0 are detectable by NMR spectroscopy (NMR-active nuclei, such as 1H, 2H, 13C and 15N).