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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev105

Regarding the replacements for CFCs, which statements are correct?

  1. AHFCs contain no chlorine and therefore have zero ozone depletion potential.
  2. BHCFCs contain C-H bonds that permit partial breakdown in the troposphere.
  3. CHCFCs contain no chlorine atoms.
  4. DHFCs are infrared-absorbing and can contribute to global warming.

Answer: A, B, D

HFCs have only C, H, F and so cannot supply chlorine. HCFCs have both Cl and H; the C-H bond aids tropospheric removal, which lowers their ODP, though it remains nonzero. Halocarbons in general absorb infrared and add to warming.
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