Hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) are good substitutes for chlorofluorocarbons (CFCs) because?

C-F bonds will react more easily with hydroxyl radicals, so they are broken down before they reach the stratosphere.

they are also greenhouse gases.

C-H bonds will react more easily with hydroxyl radicals, so they are broken down before they reach the stratosphere.

they are too heavy to reach the stratosphere.
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