MHT CET · Chemistry · Haloalkanes and Haloarenes

Which among the following reactions is used for the preparation of alkyl fluorides?

A Finkelstein reaction
B Swartz reaction
C Fittig reaction
D Wurtz reaction

Verified Solution

Answer & Solution

Correct Answer

(B) Swartz reaction

Step-by-step Solution

Detailed explanation

Alkyl fluorides are prepared by heating alkyl chlorides or bromides with metal fluorides such as \(\mathrm{AgF}, \mathrm{Hg}_2 \mathrm{~F}_2, \mathrm{AsF}_3, \mathrm{SbF}_3\), etc. This reaction is known as Swartz reaction.
\(\mathrm{R}-\mathrm{Cl}+\mathrm{AgF} \longrightarrow \mathrm{R}-\mathrm{F}+\mathrm{AgCl} \downarrow\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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