Question

The reaction caused by the Ultraviolet Radiation from sunlight causes the production of:
A. $S{{O}_{2}}$
B. CO
C. Ozone
D. Fluorides

Answer 1

Hint: The production of which of these gases can only take place in the presence of the sun’s UV Rays?
The chemical reaction involved for the production of this gas is involved in the creation of one of the most important layers of the Earth’s atmosphere.

Complete step-by-step answer:
The presence of UV rays causes the splitting of the oxygen molecule into two atoms of nascent Oxygen (O).
This nascent Oxygen then quickly combines with a pre-existing Oxygen molecule in the presence of UV rays to help create Ozone ($O_3$).
$3{{O}_{2}}\xrightarrow{UV\text{ Rays}}2{{O}_{3}}$

This reaction is pretty much responsible for the production of the Earth’s Ozone Layer which helps protect it from the harmful rays of the sun, a layer which has recently been compromised and is slowly being depleted due to the large-scale production of ChloroFluoroCarbons (CFCs).

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.

Therefore, we can safely conclude that the answer to this question is c) Ozone.

Note: This question, though thoroughly conceptual, can be intuitively worked out as one of the most commonly known utilities of UV Rays is their role in the generation of Ozone.
The free radical formation requires the homolytic fission of the Oxygen atom in the presence of UV rays, the name of this method is incredibly important for the final answer.