Final answer:
The neutral organic starting material is 3-tributylstannyl-2-chloropyridine.
Step-by-step explanation:
The neutral organic starting material that will react with Br2 to form 2-(bromomethyltetrahydrofuran) is 3-tributylstannyl-2-chloropyridine. In the reaction, 3-tributylstannyl-2-chloropyridine reacts with Br2 to replace the chloride atom with a bromine atom on the pyridine ring, resulting in the formation of 2-(bromomethyltetrahydrofuran).