In the first picture, give the absolute configuration (Use D/L for left molecule and R/S for the right molecule.   In the second picture, rank the groups (A,B,C,D) according to how they would be ranked when determining absolute configuration with R/S.

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.