Question
Method of preparation of alkyl halide 2 R-Br + Hg _2 F _2 2 R-F + Hg _2 Br _2 This reaction is known as
MHT CET
Chemistry
Haloalkanes and Haloarenes
2026
MHT CET 2026 (15 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. Finkelstein reaction
- B. Swartz reaction
- C. Sandmeyer reaction
- D. Wurtz reaction
Answer
B. Swartz reaction
Step-by-step solution
The synthesis of alkyl fluorides is best accomplished by heating an alkyl chloride or bromide in the presence of a metallic fluoride such as AgF , Hg _2 F _2, CoF _2, or SbF _3. The given reaction involves the conversion of an alkyl bromide to an alkyl fluoride using mercurous fluoride ( Hg _2 F _2). 2 R-Br + Hg _2 F _2 2 R-F + Hg _2 Br _2 This halogen exchange reaction for the preparation of alkyl fluorides is known as the Swarts reaction.
Related: Chemistry — Haloalkanes and Haloarenes · All PYQ Banks