Chlorofluorocarbons (CFCs), important green house gases,

A. are toxic

B. vaporize just below room temperature

C. are flamable

D. are very stable

E. destroy ozone

Choose the most appropriate answer from the options given below:

The correct answer is B, D and E only

Explanation:

Key Points

• CFCs (Chlorofluorocarbons) are important greenhouse gases, and the most appropriate answer is B, D, and E only. Let's go through each statement:
• B. Vaporize just below room temperature: 
  • Chlorofluorocarbons (CFCs) are known for their low boiling points, which means they vaporize easily at temperatures just below room temperature. This property made them convenient for various industrial applications.
• D. CFCs are very stable:
  • ​This statement is also true. CFCs are highly stable compounds, meaning they are resistant to chemical reactions and breakdown. This stability contributes to their persistence in the atmosphere, which can have detrimental effects.
• E. CFCs destroy ozone:
• This statement is true as well. CFCs are known for their destructive impact on the ozone layer.
• When released into the atmosphere, CFCs can undergo photodissociation in the stratosphere, leading to the release of chlorine atoms.
• These chlorine atoms then participate in chemical reactions that deplete ozone molecules, resulting in the thinning of the ozone layer.

Therefore, the most appropriate answer is B, D, and E only, as these statements accurately reflect the characteristics and impacts of CFCs.