Question

Distinguish between aldehyde and ketone chemical tests

Answer 1

Answer:

Aldehyde                                                                                   Ketone

1.They have the form of R-CHO.                        1.They have the form of R-CO-R'

2.More reactive than ketone                             2.Can not be oxidised without

and undergo oxidation forming                            breaking the carbon chain.

carboxylic acids.

3. Always occur at the end of a                         3.Always occurs in the middle of

carbon chain.                                                          of the chain.

4. Found in volatile solution                                4. Found in sugars.

Explanation:

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.