Which of the following is used in the production of freon refrigerant R-22?
\(\mathrm{CHCl_3}\)
Freon R-22 is chlorodifluoromethane, \(\mathrm{CHClF_2}\), a one-carbon compound with one hydrogen.
It is made by partial fluorination of chloroform with HF (Swarts-type exchange, catalysed by \(\mathrm{SbCl_5}\)):
\(\mathrm{CHCl_3+2HF\rightarrow CHClF_2+2HCl}\)
A major use of chloroform is therefore in the production of the freon refrigerant R-22.
Hence, \(\mathrm{CHCl_3}\).
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