Which of the following is the most suitable replacement for CFCs in terms of reducing their environmental impact?
(A) CH₄
(B) CH₂F₂
(C) CH₂ClF
(D) CHCl₂CClF - HSC - SSCE Chemistry - Question 6 - 2015 - Paper 1
Question 6
Which of the following is the most suitable replacement for CFCs in terms of reducing their environmental impact?
(A) CH₄
(B) CH₂F₂
(C) CH₂ClF
(D) CHCl₂CClF
Worked Solution & Example Answer:Which of the following is the most suitable replacement for CFCs in terms of reducing their environmental impact?
(A) CH₄
(B) CH₂F₂
(C) CH₂ClF
(D) CHCl₂CClF - HSC - SSCE Chemistry - Question 6 - 2015 - Paper 1
Step 1
Identify the CFC Replacement Options
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Answer
The options presented for consideration as replacements for CFCs are:
(A) CH₄ (Methane)
(B) CH₂F₂ (Difluoromethane)
(C) CH₂ClF (Chlorodifluoromethane)
(D) CHCl₂CClF (Trichlorofluoromethane)
Step 2
Evaluate Environmental Impact
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Answer
CFCs are known for their ozone-depleting properties. The best replacement option should have a lower potential for ozone depletion and a lower global warming potential (GWP).
(A) CH₄ has a significant GWP.
(B) CH₂F₂ has low ozone depletion potential compared to CFCs and a good GWP profile.
(C) CH₂ClF also has ozone-depleting substances, though lesser than CFCs.
(D) CHCl₂CClF is more similar to CFCs and retains ozone depletion potential.
Step 3
Select the Most Suitable Replacement
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Answer
Based on the evaluation of their environmental impact, (B) CH₂F₂ emerges as the most suitable replacement for CFCs due to its lower ozone depletion potential and favorable GWP profile.
