Properties of Chlorofluorocarbons (CFCs)

Steps:

• Identify key characteristics of CFCs: stable compounds used in refrigerants and aerosols.
• Evaluate each statement against known CFC behavior in the atmosphere.
• Recall that CFCs reach the stratosphere intact due to inertness, then photodissociate.
• Determine which statement accurately reflects scientific consensus on CFCs.

Why C is correct:

• CFCs are relatively chemically inert under normal conditions, as their strong C-F and C-Cl bonds resist reaction at Earth's surface, per their low reactivity defined by bond dissociation energies (C-F ~485 kJ/mol, C-Cl ~330 kJ/mol).

Why the others are wrong:

• A is wrong: Only C-Cl bonds dissociate readily by UV light in the stratosphere; C-F bonds require higher energy and remain stable.
• B is wrong: CFCs contribute to ozone depletion, but the statement implies they are the sole cause, which is inaccurate as other factors like NOx also play roles.
• D: Not enough information, as the choice is incomplete.

Final answer: C