Which is the most commonly used refrigerant Freon-12?

Step-by-step solution

The correct answer is (2) Dichlorodifluoromethane. Freon-12, also known as dichlorodifluoromethane ( CCl ₂ ~F ₂ ) , is a commonly used refrigerant. It was widely used in refrigeration and air conditioning systems for many years until its use was phased out due to concerns about ozone layer depletion. Here's a quick explanation of the other options: - (A) Monochloromonofluoromethane: This is Freon-22 (chlorodifluoromethane), another refrigerant but different from Freon-12. - (C) Chlorodifluoromethane: This is Freon-