Question:
Which of the following refrigerant is also called as Freon 22 ?
Which of the following refrigerant is also called as Freon 22 ?
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To decode refrigerant numbers (like R-22):
- Add 90 to the number: \(22 + 90 = 112\).
- The digits represent Carbon, Hydrogen, and Fluorine atoms: 1 Carbon, 1 Hydrogen, and 2 Fluorine atoms (\(CHF_2\)).
- The remaining valences of Carbon are filled with Chlorine, yielding \(CHClF_2\).
- Add 90 to the number: \(22 + 90 = 112\).
- The digits represent Carbon, Hydrogen, and Fluorine atoms: 1 Carbon, 1 Hydrogen, and 2 Fluorine atoms (\(CHF_2\)).
- The remaining valences of Carbon are filled with Chlorine, yielding \(CHClF_2\).
Updated On: Jul 21, 2026
- monochloro-monofluoro methane
- monochloro-difluoro methane
- dichloro-difluoro methane
- dichloro-monofluoro methane
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Refrigerants are identified commercially by standard numbers assigned under the ASHRAE system, which correspond to their chemical structures.
Detailed Explanation:
"Freon 22" (commonly known as R-22) is a hydrochlorofluorocarbon (HCFC) refrigerant widely used in air conditioning and refrigeration systems.
Its chemical formula is \(CHClF_2\).
The systematic chemical name for \(CHClF_2\) is monochlorodifluoromethane (or monochloro-difluoro methane).
Let us decode the other chemical names to clarify the nomenclature:
- Dichlorodifluoromethane (\(CCl_2F_2\)) is R-12, commonly known as Freon 12.
- Dichloromonofluoromethane (\(CHCl_2F\)) is R-21.
- Monochloromonofluoromethane (\(CH_2ClF\)) is R-31.
Therefore, Freon 22 corresponds to monochloro-difluoro methane.
Step 2: Final Answer:
Freon 22 is chemically known as monochloro-difluoro methane.
Refrigerants are identified commercially by standard numbers assigned under the ASHRAE system, which correspond to their chemical structures.
Detailed Explanation:
"Freon 22" (commonly known as R-22) is a hydrochlorofluorocarbon (HCFC) refrigerant widely used in air conditioning and refrigeration systems.
Its chemical formula is \(CHClF_2\).
The systematic chemical name for \(CHClF_2\) is monochlorodifluoromethane (or monochloro-difluoro methane).
Let us decode the other chemical names to clarify the nomenclature:
- Dichlorodifluoromethane (\(CCl_2F_2\)) is R-12, commonly known as Freon 12.
- Dichloromonofluoromethane (\(CHCl_2F\)) is R-21.
- Monochloromonofluoromethane (\(CH_2ClF\)) is R-31.
Therefore, Freon 22 corresponds to monochloro-difluoro methane.
Step 2: Final Answer:
Freon 22 is chemically known as monochloro-difluoro methane.
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