Which of the following compounds is responsible for depletion of ozone layer?

Question

Which of the following compounds is responsible for depletion of ozone layer? (A) Freon (B) Chloroform (C) D.D.T (D) Iodoform

Tardigrade Admin · Accepted Answer

Freons are chlorofluorocarbons introduced into the atmosphere from aerosol sprays and refrigerating equipments. They have a very long life time and when they reach stratosphere, they undergo photochemical decomposition and destroy ozone by the following sequence of reactions :

C F_{2} C l_{2} h v C F_{2} C l^{+} + C l^{+}

CFC l_{3} h v CFC l_{2}^{+} + C l^{+}

C l^{+} + O_{3} \to Cl O^{+} + O_{2}

Cl O^{+} + O \to C l^{+} + O_{2}

Q. Which of the following compounds is responsible for depletion of ozone layer?

Freon

Chloroform

D.D.T

Iodoform