Acrolein $(X)$ is one of the chemicals formed when $O_3$ and $NO_2$ react with unburnt hydrocarbons present in the polluted air. The structure of '$X$' is

  • A
    $CH_3-CH=CH_2$
  • B
    $CH_2=CH-CHO$
  • C
    $CH_2=CH-CN$
  • D
    $CH_3CO(OO)NO_2$

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