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प्रश्न
\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.
विकल्प
catalytic hydrogenation
treatment with \[\ce{LiAlH4}\]
treatment with pyridinium chlorochromate
treatment with \[\ce{KMnO4}\]
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उत्तर
\[\ce{CH3CH2OH}\] 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
\[\ce{(CrO3C5H5N.HCl)}\].
\[\ce{CH3CH2OH ->[PCC] CH3CHO}\]
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\[\begin{array}{cc}
\phantom{...................................}\ce{Br}\\
\phantom{..................................}|\\
\ce{CH3 - CH - CH - CH3 ->[HBr] CH3 - C - CH2 - CH3}\\
|\phantom{.........}|\phantom{...................................}|\phantom{...........}\\
\ce{CH3}\phantom{...}\ce{OH}\phantom{...............................}\ce{CH3}\phantom{.......}\\
\end{array}\]
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