AP EAMCET · Chemistry · Haloalkanes and Haloarenes
Identify the Swarts reaction from the following:
- A \(\mathrm{R}-\mathrm{CH}_2-\mathrm{Br}+\mathrm{Nal} \xrightarrow[\text { acetone }]{\text { dry }} \mathrm{R}-\mathrm{CH}_2-\mathrm{I}+\mathrm{NaBr}\)
- B \(2 \mathrm{R}-\mathrm{CH}_2-\mathrm{Br}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dry }}\mathrm{R}-\left(\mathrm{CH}_2\right)_2-\mathrm{R}+2 \mathrm{NaBr}\)
- C \(2 \mathrm{C}_6 \mathrm{H}_5 \mathrm{Cl}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dry }} \mathrm{C}_6 \mathrm{H}_5-\mathrm{C}_6 \mathrm{H}_5+2 \mathrm{NaCl}\)
- D \(2 \mathrm{R}-\mathrm{CH}_2-\mathrm{Br}+\mathrm{CoF}_2 \longrightarrow 2 \mathrm{R}-\mathrm{CH}_2-\mathrm{F}+\mathrm{CoBr}_2\)
Answer & Solution
Correct Answer
(D) \(2 \mathrm{R}-\mathrm{CH}_2-\mathrm{Br}+\mathrm{CoF}_2 \longrightarrow 2 \mathrm{R}-\mathrm{CH}_2-\mathrm{F}+\mathrm{CoBr}_2\)
Step-by-step Solution
Detailed explanation
The synthesis of alkyl flurorides is best accomplished by heating an alkyl chloride bromide in the presence of a metallic fluoride such as \(\mathrm{AgF}_2, \mathrm{HgF}_2\) or \(\mathrm{SbF}_3\). The reaction is termed as Swarts reaction.
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