`CH_(3)CH_(2)OH` can be converted into `CH_(3)CHO` by........... .

Options

A. catalytic hydrogenation
B. treatment with `LiAlH_(4)`
C. treatment with pyridinium chlorochromate
D. treatment with `KMnO_(4)`

Answer

C

Explanation

Ethanol `(CH_(3)CHO)` is an oxidised product of ethanol. Pyridinium chlorochromate `(C_(5)H_(5)overset(+)(N)HCloverset(-)(C)rO_(3))` oxidises primary alcohols to aldehydes. Strong oxidising agents such as `KMnO_(4)` are used for getting carboxylic acid from alcohols.
The oxidation process can be stopped at the aldehyde stage if Cr(VI) reagents such as Collin's reagent `(CrO_(3).2C_(5)H_(5)N)`, Corey's reagent or pyridinium chlorochromate and pyridinium dichromate `[(C_(5)H_(5)NH_(2))^(2+)Cr_(2)O_(7)^(2-)]` in anhydrous medium are used as the oxidising agent. So, the correct option is (c).
`underset("Ethanol")(CH_(3)CH_(2)OH)overset(PC C)rarrunderset("Ethanal")(CH_(3)CHO)`