A ketone of molecular formula C7H14O has 4 singlets in its 13C–NMR spectrum: one at 210 ppm and the other 3 below 50 ppm. Identify the ketone.
A) 4–heptanone
B) 2,4–dimethyl–3–pentanone
C) 4,4–dimethyl–2–pentanone
D) 5–methyl–3–hexanone
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