Question

Which of the following causes photochemical smog?

• A. CFC
• B. PAN
• C. Fused benzene ring compounds
• D. Heavy metals

Hint:

PAN is the major harmful component of photochemical smog.

Answer 1

The Correct Option is B

Concept:
Photochemical smog forms due to reaction of sunlight with pollutants like nitrogen oxides and hydrocarbons.
Step 1:
PAN stands for: \[ \text{Peroxyacetyl nitrate} \]
Step 2:
PAN is a major component of photochemical smog. It causes:
• Eye irritation
• Respiratory problems
Step 3:

• CFC mainly damages ozone layer
• Heavy metals cause toxicity
• Fused benzene compounds are pollutants but not main smog component
Step 4:
Thus correct answer is: \[ \boxed{\text{PAN}} \] \[ \boxed{\text{Correct Option = (2)}} \]