Question

Aldehydes and ketones may be distinguished by

Answer 1

the difference between an aldehydeand a ketone is the presence of a hydrogen atom attached to the carbon-oxygen double bond in the aldehyde. Ketones don't have that hydrogen. The presence of that hydrogen atom makesaldehydes very easy to oxidise.

Answer 2

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The following tests are used to distinguish between aldehydes & ketones :

★ Fehling's solution test : Aldehyde on heating with Fehling's solution gives red ppt (percipitate).

★ Tollen's reagent Test : Aldehydes on heating with Tollen's agent giving a shining silver mirror, ketones don't give this test.