Which sodium halide is employed in Finkelstein reaction?

Sodium iodide

The correct answer is Option (4) → Sodium iodide

The Finkelstein reaction is used to convert alkyl chlorides or bromides into alkyl iodides.

• The reaction is carried out using sodium iodide (NaI) in acetone.
• NaCl or NaBr precipitates out, driving the reaction forward.