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JEE Main levelSingle correct optionDifficulty 2 of 3ev075

Which statement about hydrofluorocarbons such as is correct?

  1. AThey cause no chlorine-catalysed ozone loss but can still absorb infrared and add to global warming
  2. BThey destroy ozone faster than CFCs because of the strong C-F bond
  3. CThey do not absorb infrared and so have no warming effect
  4. DThey release bromine atoms in the stratosphere

Answer: A

With no chlorine (or bromine) there is no halogen chain on ozone. The molecule still has C-F and C-H bonds with strong infrared absorption, so it is a greenhouse gas.
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