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From the molecular formula, the compound has "1 degree of unsaturation" (one double bond or ring).

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The proton NMR has a quartet and a triplet, indicating a CH₂ adjacent to a CH₃. The peak at 2.5 is in the area generally observed for methyl groups adjacent to mildly electronegative groups; the peak at 1.2 is in the region for simple methyl groups adjacent to carbons (CH₃CH₂). The molecule contains oxygen, but the peak at 2.5 is not shifted enough for this to represent an -O- linkage, so it must represent a carbonyl.

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Structure:
IUPAC Name: diethyl ketone (3-pentanone)