Primary and secondary precursors of photochemical smog are respectively:

nitrogen dioxide and hydrocarbons

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hydrocarbons and peroxyacetyl nitrate

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peroxyacetyl nitrate and oxygen

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C O_{2}

and ozone

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Solution

The correct option is B hydrocarbons and peroxyacetyl nitrate
Primary and secondary precursors of photochemical smog are hydrocarbons and peroxyacetyl nitrate respectively.
Reactive hydrocarbons (containing C=C double bond) from automibiles are converted into aldehyde. Then aldehyde is converted into peroxyacetyl nitrate (PAN). PAN is a constituent of smog and produces irritation to eyes.

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