Which one among the following are the primary reactants of photochemical smog?

Correct option is C

The correct answer is (c) Nitric Oxide and Unburnt Hydrocarbons
Explanation:
• Photochemical smog forms when NOx (mainly NO) and volatile organic compounds (unburnt hydrocarbons) react under sunlight.
• UV-driven reactions produce ozone (O₃), PANs, aldehydes—harmful secondary pollutants.
• Sulphur compounds are tied more to classical/industrial (London) smog.
Information Booster:
• Also called Los Angeles-type smog.
• Vehicle emissions are major urban sources.