Heterocycle C, C₅H₆O, exhibits ¹H NMR spectrum C and is converted by H₂ and Raney nickel into compound D, C₅H₁₀O, with spectrum D. Identify compounds C and D. (Note: The coupling constants of the compounds in this problem and the next one are rather small; they are therefore not nearly as useful in structure elucidation as those around a benzene ring.) 

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1Η ΝMR 3 H 7.4 7.3 6.3 6.2 6.1 6.0 2.4 2.3 1H IH IH (CH;),Si 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 300-MHz 'H NMR spectrum ppm (d)