Compounds A and B are isomers with the formula C3H6O. A has a peak at 1730 cm^?1 in its IR spectrum and B has a peak at 1715cm^?1, the mass spectra of A and B are as follows, show the structures of A and B.

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100 29 | Mass spectrum of A 58 50 140 70 80 90 100 110 120 130 20 30 40 50 60 100 43 Mass spectrum of B 50 58 140 120 130 70 80 90 100 110 30 40 50 60 20 Relative abundance Relative abundance