Answer:
(c) Hydrocarbons present in
atmosphere combine with oxygen atom produced by the photolysis of \[N{{O}_{2}}\]
to form highly reactive intermediate called free radical. Free radical initiates
a series of reactions. Peroxyacyl nitrates are formed, which can be said as
secondary pollutant.
\[RH+O\to
{{R}^{\centerdot }}+RC{{O}^{\centerdot }}\]
\[RC{{O}^{\centerdot
}}+{{O}_{2}}\to RCO_{3}^{\centerdot }\]
\[RCO_{3}^{\centerdot
}+N{{O}_{2}}\to
\underset{\operatorname{Peroxyacyl}\,nitrate}{\mathop{RC{{O}_{3}}\cdot
N{{O}_{2}}}}\,\]
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