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Chemistry Question on Haloalkanes and Haloarenes

Which of the following is the correct method of preparation of methyl fluoride?

A

CH4+HF→C{{H}_{4}}+HF\xrightarrow{{}}

B

CH3OH+HF→C{{H}_{3}}OH+HF\xrightarrow{{}}

C

CH4+F2→C{{H}_{4}}+{{F}_{2}}\xrightarrow{{}}

D

CH3Br+AgF→C{{H}_{3}}Br+AgF\xrightarrow{{}}

Answer

CH3Br+AgF→C{{H}_{3}}Br+AgF\xrightarrow{{}}

Explanation

Solution

Fluorination of hydrocarbons with pure F2{{F}_{2}} gas occurs explosively. Thus, alkyl fluorides are more conveniently prepared indirectly by heating suitable chloro or bromoalkanes with inorganic fluorides.
CH3Brbromomethane  +AgF→ CH3Ffluoromethane  + AgBr\underset{bromomethane}{\mathop{C{{H}_{3}}Br}}\,~+AgF\xrightarrow[{}]{{}}~\underset{fluoromethane}{\mathop{C{{H}_{3}}F}}\,~+\text{ }AgBr This reaction is called Swarts reaction.