Question

Which of the following is used in the production of freon refrigerant R-22?

• A. CHCl$_3$
• B. CH$_3$Cl
• C. (C$_2$H$_5$)$_2$O
• D. CCl$_4$
• E. CH$_2$Cl$_2$

Hint:

Chemistry Tip: Chloroform (CHCl$_3$) is a common textbook precursor in freon preparation questions.

Answer 1

The Correct Option is A

Concept:
Freon refrigerants are chlorofluorocarbon / hydrochlorofluorocarbon compounds prepared by halogen substitution reactions of methane derivatives. R-22 is: $$\text{CHClF}_2$$ Its common name is chlorodifluoromethane.
Step 1: Identify precursor used industrially.
R-22 is commonly prepared from chloroform: $$\text{CHCl}_3$$ by replacement of chlorine atoms with fluorine using fluorinating reagents such as HF.
Step 2: Why other options are less suitable?}}

• CH$_3$Cl gives different halogenated products.
• Ether is unrelated precursor.
• CCl$_4$ gives carbon tetrachloride derivatives.
• CH$_2$Cl$_2$ is not standard precursor for R-22 in this syllabus context.

Step 3: Final answer.
Thus compound used in production of freon refrigerant R-22 is: $$\boxed{\text{CHCl}_3}$$ Hence correct option is (A). :contentReference[oaicite:1]{index=1}