What was the purpose of the $Montreal$ $Protocol$?

Assertion : $UV$ radiation causes photodissociation of ozone into $O_2$ and $O$,thus causing damage to the stratospheric ozone layer.
Reason : Ozone hole is resulting in global warming and climate change

The zone of the atmosphere in which the ozone layer is present is called:

In the stratosphere,which of the following elements acts as a catalyst in the degradation of ozone and the release of molecular oxygen?

The stratospheric ozone depletion leads to:

Ultraviolet radiation from sunlight acts on $O_2$ to produce . . . . . . .