Th emajor fragmentation of the following molecule occurs through the Mclafferty rearrangement . which of the following is expected to be the base peak in the mass spectrum?  I cleaved the compound on the bonds adjacent to the alpha and calculated the mass for the biggest fragment, which was m/z= 73. The answer is actually m/z =  86. Can someone give me a step by step on how to do this problem?

Q: m/z 77 m/z 130 m/z 228 m/z 256 m2 185

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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.