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50

 You are correct in assuming that isomer A (CH3-CO-CH2-CH3) would show three resonance signals (2 CH3, CH2) in an NMR spectrum.
However, you did not take the expected chemical shifts for these protons into consideration. The signals of isomer A would be expected to have the following chemical shifts:
-CH3 : d = 0.6 ... 1.9
CH3-CO- : d = 1.7 ... 2.7
-CO-CH2- : d = 1.9 ...3.2

But which group of isomer A would give rise to the signal with d = 9.9 ppm ?

Go back to page 48 and try again!