Question

Identify the correct sequence (decreasing order) of lifetimes of the following greenhouse gases in the atmosphere:

a) Methane

b) Nitrous oxide

c) Surface ozone

d) CFC - 11

Choose the correct answer from the options given below:

1. d > b > a > c
2. b > d > a > c
3. b > d > c > a
4. d > b > c > a

Answer 1

Correct Answer - Option 2 : b > d > a > c

GHGs	Lifetime	Properties
Methane	12±3 years	A chemical compound with one atom o carbon and four atoms of hydrogen. Main constituents of natural gas
Nitrous oxide	120 years	Commonly known as laughing gas Colorless, non-flammable gas with a slight metallic scent and taste It is soluble in water.
Surface ozone	22 days	Tropospheric ozone or surface ozone is known as atmospheric pollutants It reacts with hydrocarbons and nitrogen oxides
CFC - 11	45 years	Also called Trichlorofluoromethane, also called freon-11, CFC-11, or R-11. It is a colorless, faintly ethereal, and sweetish-smelling liquid that boils around room temperature.

Therefore, the correct sequence (decreasing order) of lifetimes of the following greenhouse gases in the atmosphere is b > d > a > c.