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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:
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!