After combustion analysis and mass spectrometry, the molecular formula of an unknown compound was determined to be C15H1402. The first two suggested structures are shown as A and B and the IR spectrum obtained, Fig. 2, can be used to distinguish between A and B. Explain, with reasoning, which of the two structures is the correct one. aio IR Spectrum (thin film) 4000 A 3000 2000 1698 v (cm¹) Fig. 2 B 1600 008 1200 00S 800 008

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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.