Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Hydrofluorocarbons (HFCs), replacements of ozone depleting substances chlorofluorocarbons (CFCs) were also decided to be phased out during copenhagen-1992 conference

Reason R: HFCs have shorter lifetime than CFCs and contain no Chlorine and bromine

In the light of the above statements, choose the correct answer from the options given below.

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UGC NET Official Paper 1: Held On 19 June 2023 Shift 1
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  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true but R is NOT the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Answer (Detailed Solution Below)

Option 4 : A is false but R is true
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UGC NET Paper 1: Held on 21st August 2024 Shift 1
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Detailed Solution

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The correct answer would be "A is false but R is true."
Important Points

Assertion A: Hydrofluorocarbons (HFCs), replacements of ozone depleting substances chlorofluorocarbons (CFCs) were also decided to be phased out during the Copenhagen-1992 conference.

  • This assertion is incorrect.
  • The Copenhagen Amendment to the Montreal Protocol in 1992 did strengthen the control over several ozone-depleting substances, but it did not include any decisions about HFCs.
  • HFCs are not ozone-depleting substances, but they are potent greenhouse gases.
  • The decision to phase down the production and consumption of HFCs was taken much later, during the 28th Meeting of the Parties to the Montreal Protocol held in Kigali, Rwanda, in October 2016.
  • Hence, the claim about the Copenhagen-1992 conference is incorrect.

Reason R: HFCs have shorter lifetime than CFCs and contain no Chlorine and bromine.

  • This statement is correct.
  • HFCs, or Hydrofluorocarbons, do have a shorter atmospheric lifetime than chlorofluorocarbons (CFCs).
  • Also, HFCs do not contain any chlorine or bromine. CFCs were a problem because they released chlorine and bromine when they broke down in the atmosphere, which led to the depletion of the ozone layer.
  • HFCs, while still potent greenhouse gases that contribute to global warming, do not have this same destructive effect on the ozone layer because they lack chlorine and bromine. Therefore, this statement is correct
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