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

1. O3
2. H3C–C(=O)–OONO2
3. CH2=CHCHO
4. CF2Cl2

Correct answer: CF2Cl2

Solution

Common photochemical-smog components include ozone (O3), PAN (CH3C(O)OONO2) and acrolein (CH2=CHCHO). CF2Cl2 is a chlorofluorocarbon refrigerant, not a smog constituent.

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