A) Polyhalogens
B) Ferrocene
C) Fullerenes
D) Freons
Correct Answer: D
Solution :
Freon, a chlorofluorocarbon (CFC), is said as a refrigerant\[(C{{F}_{2}}C{{l}_{2}})\]. On exposure to UV rays in the upper part of atmosphere, Freon dissociates to give free chlorine radicals, which result in depletion of \[{{O}_{3}}\] layer. \[C{{l}_{2}}C{{F}_{2}}(g)\xrightarrow{hv}{{\,}^{.}}Cl(g){{+}^{.}}\,CCl{{F}_{2}}(g)\] \[^{.}Cl(g)+{{O}_{3}}(g)\to \,ClO{{\,}^{.}}(g)+{{O}_{2}}(g)\] \[Cl{{O}^{.}}\xrightarrow{slow}C{{l}^{.}}+{{O}^{.}}\] \[Cl{{O}^{.}}(g)+{{O}^{.}}(g)\to {{\,}^{.}}Cl(g)+{{O}_{2}}(g)\]
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