Question:

The compound that is NOT a common component of photochemical smog is :

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Photochemical smog contains O3, PAN, aldehydes and NOx; CFCs belong to stratospheric ozone depletion.
Updated On: Nov 5, 2026
  • \(\mathrm{O_3}\)
  • \(\mathrm{CH_3C(=O)OONO_2}\)
  • \(\mathrm{CH_2=CHCHO}\)
  • \(\mathrm{CF_2Cl_2}\)
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The Correct Option is D

Solution and Explanation

Photochemical smog forms when sunlight acts on nitrogen oxides and hydrocarbons. Its common components are ozone (O3), peroxyacetyl nitrate (PAN, \(\mathrm{CH_3COOONO_2}\)), acrolein (\(\mathrm{CH_2=CHCHO}\)), formaldehyde, NO2 and similar oxidants.
\(\mathrm{CF_2Cl_2}\) (freon-12, a chlorofluorocarbon) is chemically inert in the troposphere and is a cause of stratospheric ozone depletion; it is not a smog component.
Answer: (4) \(\mathrm{CF_2Cl_2}\)
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