In the reaction $\underset{\text{(Vapour)}}{C_2H_5OH} \xrightarrow[300^{\circ} C]{Cu} X$. The molecular formula of $X$ is
- A$C_4H_6O$
- B$C_4H_{10}O$
- C$C_2H_4O$
- D$C_2H_6$
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