10/06/2026
Finkelstein Reaction (CBSE Class 12)
Definition:
Finkelstein reaction is a halogen exchange reaction in which an alkyl chloride or alkyl bromide is converted into an alkyl iodide by heating with sodium iodide (NaI) in dry acetone.
Reaction:
or
Example:
Key Points for CBSE Exams:
It is a nucleophilic substitution (SN2) reaction.
Dry acetone is used as solvent.
NaCl and NaBr precipitate out, driving the reaction forward.
Used for the preparation of alkyl iodides.