Question:
Observe the following:
PAN Acrolein \(\mathrm{CF_2Cl_2}\) \(\mathrm{CH_2O}\) Vinyl chloride A B C D E
Identify the pollutants which are formed when unburnt hydrocarbons are released into atmospheric air.
Observe the following:
| PAN | Acrolein | \(\mathrm{CF_2Cl_2}\) | \(\mathrm{CH_2O}\) | Vinyl chloride |
|---|---|---|---|---|
| A | B | C | D | E |
Identify the pollutants which are formed when unburnt hydrocarbons are released into atmospheric air.
Show Hint
Photochemical smog mainly contains
\[
\boxed{\text{PAN, aldehydes (e.g., formaldehyde), ozone and acrolein}.}
\]
CFCs and vinyl chloride are not formed from unburnt hydrocarbons.
Updated On: Jul 21, 2026
- A, B, C, D, E
- A, B, D only
- A, B, E only
- B, C, D only
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Identify pollutants formed from unburnt hydrocarbons.
Unburnt hydrocarbons react with nitrogen oxides in the presence of sunlight to form photochemical pollutants such as
\[
\boxed{\text{PAN, Acrolein and Formaldehyde (CH}_2\text{O}).}
\]
Step 2: Eliminate the remaining compounds. \[ \mathrm{CF_2Cl_2} \] is a chlorofluorocarbon (CFC), not formed from unburnt hydrocarbons. Vinyl chloride is an industrial chemical and is not a product of photochemical reactions of unburnt hydrocarbons.
Step 3: Write the answer. Hence, the pollutants formed are \[ \boxed{\text{A, B and D only}.} \] Thus, \[ \boxed{(B)} \] is the correct answer.
Step 2: Eliminate the remaining compounds. \[ \mathrm{CF_2Cl_2} \] is a chlorofluorocarbon (CFC), not formed from unburnt hydrocarbons. Vinyl chloride is an industrial chemical and is not a product of photochemical reactions of unburnt hydrocarbons.
Step 3: Write the answer. Hence, the pollutants formed are \[ \boxed{\text{A, B and D only}.} \] Thus, \[ \boxed{(B)} \] is the correct answer.
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