Photochemical smog consists of excessive amount of $X$ , in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth. $X$ is:

O_{3}

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C H_{4}

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C O_{2}

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C O

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Solution

The correct option is B $O_{3}$
Photochemical smog consists of an excessive amount of $X$ , in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth. $X$ is ozone $(O_{3})$ .

Ozone interacts with reactive hydrocarbons (containing $C = C$ bond) to form hydrocarbon free radical $(R - ˙ C H_{2})$ .

Suggest Corrections

Column I	Column II
p. Peroxy acetyl nitrate	1. Waste incineration
q. Polycyclic aromatic hydrocarbons	2. Global warming
r. Dioxins	3. Photochemical smog
s. Indigo	4. Carcinogens
t. IR active molecules	5. Vat dye

List I	List II
(i) Peroxy acetyl nitrate	1. Carcinogens
(ii) Polycyclic aromatic hydrocarbons	2. Global warming
(iii) IR active molecules	3. Photochemical smog
(iv) Dioxins	4. Waste incineration