NMR spectroscopy (ignore answers there: a-f) H nuclei located near electronegati

Question

NMR spectroscopy (ignore answers there: a-f) H nuclei located near electronegative atoms tend to be relative to the 'H nuclei that are not . How many signals would you expect to see in the 'HNMR spectrum of 2-bromo-3-methyl-2-butene? What would be the integration ratio of the signals in the 'H NMR spectrum of 2-bromo -3methyl-2-butene? (CDCI_3, TMS, H_2O, or DMSO, circle the correct one ) is commonly used as an internal reference in NMR spectroscopy; its signal is assigned 0 ppm in both 'H and ^13C NMR spectroscopy. The chemical shift of the carbonyl carbon in acetone is about. What type of carbon-13 NMR spectra can indicate wither a signal is produced by a CH_3, CH_2,CH, or C?

Explanation / Answer

Solution :-

a). H located near the electronegative atom shows the downfield peaks therefore they are deshielded .

b) .2-bromo-3-methyl-2-butene can only show 2 signals in the HNMR

c) the ratio for the HNMR peaks will be 2 : 1 because (2 CH3 group are equivalent ) and 1 CH3 group is different

d) TMS is the solvent used as the reference in the NMR spectroscopy

e) The chemical shift of the carbonyl carbon in acetone that is ( C=O) group is about 205 ppm

f) the DEPT spectra indicate the presence of the CH, CH3 or CH2 groups

CH and CH3 groups gives the upward signal and CH2 gives the downword signal.

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