Which reaction is not involved in photochemical smog formation?

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${NO}_{2} (g) \overset{h v}{⟶} NO (g) + O (g)$

$3 {CH}_{4} (g) + 2 O_{3} (g) ⟶ 3 {CH}_{2} = O (g) + 3 H_{2} O$

$NO (g) + O_{3} (g) ⟶ {NO}_{2} (g) + O_{2} (g)$

${SO}_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ {SO}_{3} (g)$

answer is B.

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Detailed Solution

In the presence of sunshine, smoke, dust, and fog particles react with hydrocarbons and nitrogen oxides (like $NO$ ) to create photochemical smog. It is smoky and brown in color.

${SO}_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ {SO}_{3} (g)$
Ozone ( $O_{3}$ ), which functions as an initiator of several processes that result in the creation of photochemical smog, contributes to photochemical smog.
However, ${SO}_{2}$ makes no contribution to photochemical smog in any way.