Explanation

(d)
(a)$NO + O_{3} \rightarrow NO_{2} + O_{2}$
$O_{3} + hv \rightarrow O_{2} + O$
$NO_{2} + O \rightarrow NO + O_{2}$
Net reaction $2O_{3} + hv \rightarrow 3O_{2}$
Thus, ozone layer is depleted by oxides of nitrogen.
(b)Ozone layer is a protective layer and absorbs harmful UV rays coming from the sun.
(c )$Cl + O_{3} \rightarrow ClO + O_{2}$
$O_{3} + hv \rightarrow O + O_{2}$
$ClO + O \rightarrow Cl + O_{2}$
Net reaction $2O_{3} + hv \rightarrow 3O_{2}$
Thus, ozone layer is also depleted by reaction with freons.
(d)is a incorrect statement as