When compound 'X' is oxidised by acidified potassium dichromate , compound 'Y' is formed. Compound 'Y' on redcution with `LiAlH_(4)` gives 'X'. 'X', and 'Y' respectively are `:`

Options

A. `C_(2)H_(5)OH, CH_(3)COOH`
B. `CH_(3)COCH_(3), CH_(3)COOH`
C. `C_(2)H_(5)OH, CH_(3)COCH_(3)`
D. `CH_(3)CHO, CH_(3)COCH_(3)`

Answer

A

Explanation

When ethyl alcohol is oxidised by acidified potassium dichromate, `CH_(3)COOH(Y)` is obtained.
`underset("(X)")(3C_(2)H_(5)OH)+2K_(2)Cr_(2)O_(7) +8H_(2)SO_(4) rarr underset("(Y)")(3CH_(3)COOH)+2Cr_(2)(SO_(4))_(3)+2K_(2)SO_(4)+11H_(2)O`
Carboxylic acid undergoes reduction with `LiAlH_(4)` to give primary alcohol
`underset("(Y)")(CH_(3)-C-overset(O)overset(||)C-OH) overset(LiAlH_(4))underset("(Ether)")rarr underset("(X)")(CH_(3)CH_(2)OH)`
So, X is `CH_(3)CH_(2)OH and Y` is `CH_(3)COOH.`