Which of the following compounds has the least Ozone Depleting Potential?

Which of the following compounds has the least Ozone Depleting Potential?

  • CFC-11
  • Halons
  • HCFCs
  • Methyl Bromide

Ozone Depleting Potential (ODP)

  • Ozone Depleting Potential (ODP) is a measure of the ability of a substance to deplete the ozone layer.
  • The ozone layer is a layer of the Earth’s atmosphere that protects life on the planet from harmful ultraviolet (UV) radiation from the sun. Many chemicals, including some chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and halons, have been found to be harmful to the ozone layer.
  • These substances have a high ODP because they can break down the ozone molecules in the atmosphere, leading to a thinning of the ozone layer.
  • This thinning can increase the amount of UV radiation that reaches the Earth’s surface, which can have harmful effects on people and the environment.
  • The ODP of a substance is typically measured in units of “ozone-depletion units” (ODU). The higher the ODP of a substance, the more damaging it is to the ozone layer.
  • Ozone-depleting substances include:
    • Chlorofluorocarbons (CFCs)
    • Hydrobromofluorocarbons (HBFCs)
    • Halons
    • Methyl Bromide- ODP
    • Carbon tetrachloride
    • Methyl Chloroform


CFC-11, also known as trichlorofluoromethane, is a chlorofluorocarbon (CFC) that was commonly used as a refrigerant, solvent, and aerosol propellant. It is one of the most potent greenhouse gases, with a global warming potential that is about 4,000 times greater than carbon dioxide.

The use of CFC-11 has been banned under the Montreal Protocol, an international treaty that aims to phase out the production and use of ozone-depleting substances. However, in recent years, there have been reports of illegal production and use of CFC-11 in several countries, despite the ban.

The release of CFC-11 into the atmosphere can have serious consequences for the Earth’s ozone layer, which protects the planet from harmful UV radiation. It can also contribute to climate change by trapping heat in the atmosphere. It is important to continue to monitor and enforce the ban on CFC-11 to protect the environment and our planet.


Halons are a group of halogen-based fire suppression agents that were commonly used in the past to extinguish fires in places such as aircraft, ships, and buildings.

They are highly effective at extinguishing fires, but they also have a high potential for ozone depletion and contribute to global warming.

Because of these environmental concerns, the production and use of halons have been significantly restricted or banned in many countries. Alternative fire suppression agents, such as carbon dioxide and water mist systems, are now more commonly used.

HCFCs (hydrochlorofluorocarbons)

HCFCs (hydrochlorofluorocarbons) are chemical compounds that contain hydrogen, chlorine, fluorine, and carbon atoms. They were originally developed as a safer alternative to the more harmful chlorofluorocarbons (CFCs), which were used as refrigerants and foam-blowing agents.

However, HCFCs have been found to have a negative impact on the ozone layer, so their production and use have been phased out under the Montreal Protocol, an international treaty designed to protect the ozone layer. They are now being replaced by more environmentally-friendly alternatives, such as hydrofluorocarbons (HFCs) and natural refrigerants.

Hydrochlorofluorocarbons (HCFCs)- least ODP ranging from 0.01-0.1

Methyl Bromide

Methyl bromide is a chemical compound used as a fumigant and pesticide. It is highly effective at killing insects, nematodes, and fungi, but it is also toxic to humans and other animals.

Methyl bromide has been banned for use in many countries due to its high potential for ozone depletion and negative impact on the environment. However, it is still used in some countries for certain crops, such as strawberries and tomatoes, where alternatives have not been as effective.

Methyl bromide is typically applied in the form of a gas or vapor, and it can penetrate soil and other materials to reach pests that are hidden or hard to reach. It is important to use caution and protective measures when handling methyl bromide to avoid accidental exposure.

Hydrochlorofluorocarbons (HCFCs)– least ODP ranging from 0.01-0.1. Hence, HCFCs is the correct answer.


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