Question

Which one of the following is not a common component of Photochemical Smog?
A. Ozone
B. Acrolein
C. Peroxyacetyl nitrate
D. Chlorofluorocarbons

Answer 1

Hint: Formation of photochemical smog occurs in the presence of certain air polluting agents which forms toxic components in the presence of sunlight. The sunlight produces the specific chemical components which are toxic to the environment and this smog is detrimental to the pulmonary health of the people.

Complete answer:
There are various chemical elements or gases which are released from the different sources that damage the atmosphere. This is because such components are air polluting agents which can be damaging to the body system. Hence it is detrimental to the whole environment and the organism living in it. The photochemical smog occurs as a result of high air pollution levels in a particular region and the more noxious compounds are formed when the agents are exposed to sunlight only. The energy is required for the production of compounds. Some common components are ozone, acrolein, oxides of nitrogen and sulphur, highly volatile carbon compounds that mix with the atmosphere. Some of the common nitrogenous compounds are $NOX$, $PAN$ of which $PAN$ is peroxyacetyl nitrate which is a component of the photochemical smog. But the $CFC$ or chlorofluorocarbon is not a component of the smog as it takes part in the depletion of the ozone layer. This depletion can result in climate changes but it is not part of the smog.

Hence, option D is correct.

Note:
Formation of smog is directly related to the emissions of the components which can form the related components. Thus, the number of industries and the regulation of pollution caused by them shows the chances of formation of smog in a particular region.