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Originally Posted by 3dObject
The answer to the following question is choice B. I really have no idea how this answer is made to come about. I thought a single spike meant the presence of a single functional group, but everything here is a hydrocarbon chain. Please advice.
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There are some different analyses: IR, for functional groups, UV-VIS for multiple bonds and NMR for hydrogen atoms (mainly bonded with carbon). Because NMR signal is related with the spin of the hydrogen atom, different positions of signal appear in the spectra.