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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