When compound $X$ undergoes complete combustion, the products are carbon dioxide and water only. A portion of $X$ is combined with aqueous potassium dichromate and heated under reflux for one hour. The resulting mixture is then distilled, and the only organic product obtained is collected. The collected organic product reacts with sodium to produce hydrogen, but it does not react with 2,4-dinitrophenylhydrazine reagent and it does not react with ethanol in the presence of concentrated sulfuric acid to form an ester. What conclusion can be drawn from this information?
- A$X$ is a carboxylic acid.
- B$X$ is a ketone.
- C$X$ is an alcohol.
- D$X$ is an alkane.