Arrange the following in decreasing order of Global warming potential.

1. Perfluoromethane
2. Sulphur Hexafluoride
3. HCFC 22
4. Nitrous Oxide

Select the correct answer using the codes given below.
a) 1>3>2>4
b) 2>3>1>4
c) 4>3>1>2
d) 2>1>3>4

Ans – [D] 

Explanation – Sulphur Hexafluoride has highest global warming potential (GWP) which is equal to 23,900. Perfluoromethane has GWP of 6500. HCFC 22 has GWP of 1300-1400 and Nitrous oxide has 310.