In the question given below there are 2 statements marked as Assertion (A) and Reason (R). Choose the correct alternative from the following options.

Assertion (A)- "Montreal Protocol" banned the use of CFC compounds as well as other ozone depleting chemicals such as carbon tetrachloride, trichloroethane etc.

Reason (R)- CFC's helped in the formation of ozone layer, which harmed the living organisms.

(A) Is true but (R) is false.           

The correct answer is Option 3: (A) Is true but (R) is false.

Explanation:

• Assertion (A): "Montreal Protocol banned the use of CFC compounds as well as other ozone depleting chemicals such as carbon tetrachloride, trichloroethane etc." This is true. The Montreal Protocol was established to phase out substances that deplete the ozone layer, including CFCs and other harmful chemicals.

• Reason (R): "CFC's helped in the formation of ozone layer, which harmed the living organisms." This is false. CFCs (chlorofluorocarbons) do not help in the formation of the ozone layer; rather, they contribute to its depletion by breaking down ozone molecules. Ozone depletion harms living organisms because it reduces the layer's ability to block harmful ultraviolet (UV) radiation from the sun.