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How can an aldehyde be distinguished from a ketone?

An aldehyde will react with Tollen's reagent to form a characteristic silver mirror, whereas a ketone will not react. This is because an aldehyde can be oxidised to a carboxylic acid, reducing Tollen's reagent, whereas a ketone cannot be oxidised so cannot take part in the reaction.

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How can an aldehyde be distinguished from a ketone?

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