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The molecular formula C4H8O indicates that the molecule could be either an aldehyde, ketone, alcohol, or an ether with one degree of unsaturation. Infrared (IR) spectroscopy provides key insights into functional groups. A strong absorption near 1720 cm⁻¹ typically indicates a carbonyl group (C=O), suggesting the presence of either a ketone or an aldehyde. The absence __________ ___ ________ ___ ______ ____ ____ _____ ____.
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