The pollutants which come directly in the air from sources are called primary pollutes. Primary polluants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants ?

Options

A. CO
B. Hydrocarbon
C. Peroxyacetyl nitrate
D. NO

Answer

C

Explanation

Hydrocarbons present in atmosphere combine with oxygen atom produced by the photolysis of `NO_(2)` to form highly reactive intermediate called free radical. Free radical initiates a series of reaction.
Peroxyacetyl nitrates are formed, which can be said as secondary pollutants.
Hydrocarbon + O `to RCO^(.)` (free radicals)
`RCO^(.) + O_(2) to RCO_(3)^(.)`
`RCO_(3)^(.) to underset("Peroxyacetyl nitrate")(RCO_(3)NO_(2))`