State the most likely chemical shift region for the underlined (and bolded!) element in: CH3CH2OHGroup of answer choices200+ ppm120-150 ppm50-100 ppm0-30 ppm
Question
State the most likely chemical shift region for the underlined (and bolded!) element in: CH3CH2OHGroup of answer choices200+ ppm120-150 ppm50-100 ppm0-30 ppm
Solution
The molecule CH3CH2OH is ethanol. The underlined and bolded element is the middle carbon atom, which is part of a -CH2- group.
In carbon-13 NMR spectroscopy, the chemical shift of a carbon atom depends on its electronic environment. The carbon in the -CH2- group that is directly attached to the -OH group in ethanol typically appears in the region of 50-70 ppm.
However, if we must choose from the given options, "50-100 ppm" would be the most likely chemical shift region for this carbon atom in ethanol.
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