Acroleon $(\mathrm{X})$ is one of the chemicals formed when $\mathrm{O}_3$ and $\mathrm{NO}_2$ react with unburnt hydrocarbons present in the polluted air. The structure of ' X ' is

• A

  $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}_2$
• Correct answer
  B

  $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CHO}$
• C

  $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CN}$
• D

  $\mathrm{CH}_3 \mathrm{CO}(\mathrm{OO}) \mathrm{NO}_2$

Solution

$3 \mathrm{CH}_4+2 \mathrm{O}_3 \xrightarrow{\text { Polluted air }}$

Hence, the correct answer is option: 'B'.