When compound $X$ is oxidised by acidified potassium dichromate,compound $Y$ is formed. Compound $Y$ on reduction with $LiAlH_4$ gives $X$. $X$ and $Y$ respectively are :
- A$C_2H_5OH, CH_3COOH$
- B$CH_3COCH_3, CH_3COOH$
- C$C_2H_5OH, CH_3COCH_3$
- D$CH_3CHO, CH_3COCH_3$
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