Which of the following best describes Chlorofluorocarbons (CFC)?

Chlorofluorocarbons (CFCs) are best described as nontoxic and nonflammable chemicals used in various applications. These compounds were primarily known for their use as refrigerants in air conditioning and refrigeration systems, as well as propellants in aerosol sprays and solvents in the manufacturing of foams and plastics. Their nontoxic and nonflammable characteristics made CFCs appealing for these applications, contributing to their widespread use throughout the latter half of the 20th century.

However, despite their practical benefits, CFCs were later found to have serious environmental impacts, particularly in their contribution to ozone layer depletion. This led to international regulations that ultimately phased out their use in many countries. Understanding CFCs requires awareness of their historical applications and the environmental implications associated with them, which contextualizes their classification as useful but regulated chemicals.