A) \[NO\]
B) \[N{{O}_{2}}\]
C) \[C{{H}_{3}}\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,ON{{O}_{2}}\]
D) \[C{{H}_{2}}=CHCH=O\]
Correct Answer: B
Solution :
Photochemical smog is initiated by the photochemical dissociation of \[N{{O}_{2}}\] and the resulting secondary reactions involving unsaturated hydrocarbons, other organic compounds and free radicals, leading to the formation of organic peroxides and ozone, \[N{{O}_{2}}(g)\xrightarrow{UV\,\,light}NO(g)+[O]]\] \[{{O}_{2}}(g)+[O]\xrightarrow{{}}{{O}_{3}}(g)\] Hydrocarbons\[+{{O}_{3}},\,\,{{O}_{2}},\,\,O,\,\,N{{O}_{2}},\,\,NO:\] Peroxides, peroxyacetyl nitrate, formaldehyde, ozone aldehyde, acrolein etc. (oxidized hydrocarbons) These oxidized hydrocarbons and ozone in the presence of humidity cause photochemical smog, which dissipates at night.
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