Question

\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.

Options

• catalytic hydrogenation

• treatment with \[\ce{LiAlH4}\]

• treatment with pyridinium chlorochromate

• treatment with \[\ce{KMnO4}\]

Answer 1

\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by treatment with pyridinium chlorochromate.

Explanation:

Alcohols are oxidized to aldehydes and finally to acids.

\[\ce{CH3CH2OH ->[{[O]}] CH3CHO ->[{[O]}] CH3COOH}\]

Oxidations can be stooped at aldehyde stage by using pyridinium chlorochromate

\[\ce{(CrO3C5H5N.HCl)}\].

\[\ce{CH3CH2OH ->[PCC] CH3CHO}\]