Freon refrigerants: formula and preparation

This type of question, asked 3 times: 9 May 2023 S2, 11 May 2023 S1, 26 Apr 2025 S2. All 3 questions below, oldest first.

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Question 1
9 May 2023 S2
100 $Which is the most commonly used refrigerant Freon-12?$
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Question 2
11 May 2023 S1
85 $Which from following compounds is used to prepare refrigerant-22?$
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Question 3
26 Apr 2025 S2
61 $Which from following is the most commonly used refrigerant Freon-12?$
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