In the stratosphere, the radical Cl^' produced from chlorofluorocarbons reacts with O₃ as follows

Cl^' + O₃ \(\longrightarrow\) X + colorless gas

2X \(\longrightarrow\) X₂

X₂ \(\longrightarrow\) Cl' + Y

X, Y are, respectively

The correct answer is 

Concept:-

• Photolysis: This is a process by which molecules are broken down into smaller units through the absorption of light. In this case, CFCs in the stratosphere absorb UV light and break down to release chlorine radicals, which starts the whole reaction chain.
• Catalysis: This is a process in which a substance (in this case, a chlorine radical) speeds up a chemical reaction without being consumed itself. This chlorine radical, derived from CFCs, acts as a catalyst to break down ozone into oxygen.
• Ozone Depletion: This series of reactions ultimately leads to the depletion of the ozone layer in the stratosphere - an environmental problem of substantial concern as the ozone layer plays a crucial role in absorbing the majority of the Sun's harmful ultraviolet (UV) radiation.

Explanation:-

Hence, X, Y are, respectively CIO', CI — O — O'