Question
How is an aldehyde obtained from an alcohol?
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Answer
When a primary alcohol is oxidized with potassium dichromate and dil. $H _2 SO _4$ under controlled conditions, an aldehyde is obtained.
$\underset{\text { Alcobol }}{ R - CH _2 OH }+( O ) \xrightarrow[ H _2 SO _4]{ K _2 Cr _2 O _7} \underset{\text { Aldehyde }}{ R }- CHO + H _2 O$
For example, when ethanol is oxidized with potassium dichromate and dil. $H _2 SO _4$ under controlled conditions, acetaldehyde (ethanal) is obtained.
$\underset{\text { Alcobol }}{ R - CH _2 OH }+( O ) \xrightarrow[ H _2 SO _4]{ K _2 Cr _2 O _7} \underset{\text { Aldehyde }}{ R }- CHO + H _2 O$
For example, when ethanol is oxidized with potassium dichromate and dil. $H _2 SO _4$ under controlled conditions, acetaldehyde (ethanal) is obtained.
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