MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The Finkelstein reaction is a halogen exchange reaction used for the synthesis of alkyl iodides from alkyl chlorides or alkyl bromides. The reaction involves treating an alkyl chloride or bromide with sodium iodide (NaI) in dry acetone. R-X + NaI dry acetone R-I + NaX where X = Cl, Br. Sodium iodide is soluble in dry acetone, whereas sodium chloride and sodium bromide are insoluble and precipitate out. This precipitation drives the forward reaction according to Le Chatelier's principle. Answer: NaI in dry acetone