Using your roadmaps as a guide, show how to convert 1-bromopropane and carbon dioxide into 4-heptanone. You must use 1-bromopropane and carbon dioxide as the source of all carbon atoms in the target molecule. Show all reagents and all molecules synthesized along the way.

Answer: To convert 1-bromopropane and carbon dioxide into 4-heptanone, follow these steps: 1. Formation of Grignard Reagent - React 1-bromopropane with magnesium in dry ether to form propylmagnesium bromide (C3H7MgBr). 2. Reaction with Carbon Dioxide - Add carbon dioxide to the Grignard reaction mixture to form magnesium salt intermediate (C3H7CO2MgBr). 3. Formation of Carboxylic Acid - Hydrolyze the magnesium salt intermediate using a dilute acid to form butanoic acid (C3H7CO2H). 4. α-haloacylation of Butanoic Acid - Perform α-haloacylation using halogen and phosphorus tribromide (PBr3) to form 2-bromoheptanoic acid (C3H6BrCO2H). 5. Formation of 4-heptanone - React 2-bromoheptanoic acid with lithium aluminum hydride (LiAlH4) to form the final product, 4-heptanone (C3H6BrCOCH3).