Which of the following reactions does not contribute to air pollution in the troposphere?

Options

A. `C_4H_(10(g))+6O_(2(g)) to CO_((g)) + 2CO_(2(g))+5H_2O_((l))`
B. `N_(2(g))+O_(2(g)) overset("Lighting")to2NO`
`2NO_((g)) + O_(2(g)) to 2NO_(2(g))`
C. `2HCHO to CH_(4(g)) + CO_(2(g))`
D. `Cl+O_(3(g)) to ClO + O_(2(g))`

Answer

D

Explanation

The first reaction takes place during incomplete combustion of fossil fuels and releases oxides of carbon into the troposphere. The second set of reactions represents formation of oxides of nitrogen in the troposphere. The third reaction represents formation of hydrocarbons due to incomplete combustion of fuels or anaerobic decomposition of organic matter. The fourth reaction between chlorine radical and ozone takes place in the stratosphere and leads to depletion of ozone in the stratosphere. Chlorine free radical is obtained from chlorofluorocarbons released into the atmosphere.
`F_2 C Cl_2(g) overset(hv)to F_2dotC -Cl(g) + ddot(Cl)(g)`