Question

The refrigerant R-22 is:

• A. Monochloro trifluoro methane
• B. Dichloro difluoro methane
• C. Tetrachloro difluoro ethane
• D. Trichloro monofluoro methane

Hint:

R-22 = HCFC = dichloro difluoro methane → CHClF$_2$!

Answer 1

The Correct Option is B

R-22 is a common refrigerant used in residential and light commercial air conditioning systems.
Its chemical name is dichloro difluoro methane and its chemical formula is CHClF$_2$.
R-22 belongs to the hydrochlorofluorocarbon (HCFC) group.
It replaced earlier CFCs due to its lower ozone depletion potential but is being phased out in many countries.
R-12 is monochloro difluoro methane.
Other options like tetrachloro difluoro ethane and trichloro monofluoro methane refer to different CFCs.
Therefore, dichloro difluoro methane correctly identifies R-22.