Question:
The compound that is NOT a common component of photochemical smog is :
$\mathrm{O}_{3}$
$\mathrm{CH}_{2}=\mathrm{CHCHO}$
$\mathrm{CF}_{2} \mathrm{Cl}_{2}$
Correct Option: , 3
Solution:
Freons (CFC's) are not common components of photo chemical smog.