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Question

Chemistry Question on Haloalkanes and Haloarenes

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

A

Freon

B

Chloroform

C

D.D.T

D

Iodoform

Answer

Freon

Explanation

Solution

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 :
CF2Cl2−>[hv]CF2Cl++Cl+{CF_2 Cl_2 ->[hv] CF_2Cl+ + Cl+ }
CFCl3−>[hv]CFCl2++Cl+{CFCl_3 ->[hv] CFCl_2^+ + Cl+ }
Cl++O3−>ClO++O2{ Cl^+ + O_3 -> ClO^+ +O_2}
ClO++O−>Cl++O2{ ClO^+ + O -> Cl^+ + O_2}