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Compounds A and B are isomeric diketones of molecular formula C6H10O2

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Compounds A and B are isomeric diketones of molecular formula C6H10O2. The 1H NMR spectrum of compound A contains two signals, both singlets, at d 2.2 (6 protons) and 2.8 ppm (4 protons). The 1H NMR spectrum of compound B contains two signals, one at d 1.3 ppm (triplet, 6 protons) and the other at d 2.8 ppm (quartet, 4 protons). What are the structures of compounds A and B?