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MHT CET202620 April 2026Evening ShiftChemistryHaloalkanes and HaloarenesActual

In Finkelstein reaction, which one of the following reagents is used?

Options

  1. AHI in dry acetone
  2. BNaI in dry acetone
  3. CNaOI in dry acetone
  4. DNaI in dry ether

Correct answer

B. NaI in dry acetone

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

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