The mass spectrum of Compound D, with a molecular formula C8H7BrO2 is shown below. Calculate the degree of unsaturation of Compound D. What information can be obtained from the calculated degree of unsaturation?

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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.