Homework Answers
ANSWER=The structure is given
(i) Chemical shift values,
H(a)=2.05 ppm
H(b) = 6.82ppm
H(c)= 6.08ppm
H(d) = 2.27ppm
(ii) Multiplicity
H(a)= doublet
H(b) = doublet of quartet
H(c)= doublet
H(d) = singlet
(iii) tree diagram for splitting pattern
Jbc= 15Hz, Jab= 7Hz
because Jbc has high value than Jab so H(b) will overlap with H(c) first and then will overlap with H(a) and H(b) will give doublet of quartet.
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3. Predict the 1H NMR spectrum of the molecule shown to the left. Be sure to include the x-axis for the 'H NMR spectrum labelled with units, peaks for each of the non-equivalent protons clearly showing the expected splitting patterns, approximate chemical shifts, and integration
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for...
Label each proton with the predicted splitting pattern it would
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Label each proton with the predicted splitting pattern it would exhibit in a H NMR spectrum. Singlet Doublet Triplet Quartet Quintet CH3
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