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How is an aldehyde obtained from an alcohol ?

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How is an aldehyde obtained from an alcohol?

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When a primary alcohol is oxidized with potassium dichromate and dil. H2SO4 under controlled conditions, an aldehyde is obtained.

For example,

When ethanol is oxidized with potassium dichromate and dil. H2SO4 under controlled conditions, acetaldehyde (ethanal) is obtained.

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