Kerala KEAM 5 June 2024 Solved Paper

Step 1: The given reaction involves the substitution of a halide in an alkyl halide ($CH_3Br$) by a fluoride ion ($F^-$) from silver fluoride ($AgF$), resulting in the formation of methyl fluoride ($CH_3F$) and silver bromide ($AgBr$).Step 2: This reaction is known as the Swarts reaction, which is a type of nucleophilic substitution reaction. In the Swarts reaction, a halide (usually fluorine) is substituted for another halide in the presence of a metal fluoride. It is specifically used to prepare alkyl fluorides from alkyl halides using silver fluoride ($AgF$) as the fluorine source.Step 3: The other reactions listed do not involve halide exchange in the same manner:- The Finkelstein reaction involves the exchange of halides using sodium halides (e.g., NaCl or NaI).- The Wurtz reaction is a coupling reaction of two alkyl halides with sodium metal.- Sandmeyer's reaction involves the substitution of halides with aryl groups, using copper salts.- Williamson’s reaction involves the preparation of ethers by reacting an alkoxide ion with an alkyl halide.Thus, the correct answer is option (E), Swarts reaction.Quick Tip: The Swarts reaction is specifically used for halide exchange, particularly in the synthesis of alkyl fluorides from alkyl halides by using silver fluoride ($AgF$).