The brown haze of photochemical smog is largely attributable to :

N O

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N O_{2}

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C H_{3} C | | O O O N O_{2}

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C H_{2} = C H C H O

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Solution

The correct option is A $N O_{2}$
Photochemical smog is initiated by the photothemical dissociation of $N O_{2}$ andthe resulting secondary reactions involves unsaturated hydrocarbons, other organic compounds and free radicals, leading to the formation of organic peroxides and ozone.

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