Using your roadmaps as a guide, show how to convert ethanol into 2-pentanone. You must use ethanol as the source of all carbon atoms in the target molecule. Show all reagents and all molecules synthesized along the way.

Question: Outline the steps to convert ethanol (C2H5OH) into 2-pentanone (C5H10O) using ethanol as the exclusive carbon source. Answer: To convert ethanol into 2-pentanone, follow these steps: 1. Oxidize ethanol into acetaldehyde using pyridinium chlorochromate (PCC). 2. Add a cyanide ion to the acetaldehyde to form cyanohydrin using NaCN or KCN. 3. Reduce cyanohydrin's cyanide group to a primary amine with lithium aluminum hydride (LAH). 4. Oxidize the primary amine to nitrile using tetranitromethane (TNM). 5. Convert another ethanol molecule into bromoethane with PBr3, then into an ethyl Grignard reagent using magnesium (Mg). 6. Add the Grignard reagent to the nitrile from step 4, forming a new carbon-carbon bond. 7. Hydrolyze the product with aqueous acid, then remove the hydroxyl group, resulting in the final product, 2-pentanone.