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7 Cards in this Set

  • Front
  • Back

There are 3 classifications for lalcohols:

1) Primary (1º).


2) Secondary (2º).


3) Tertiary (3º).

Oxidising alcohols:




1) We use?


– Results for 1º, 2º & 3º.

1) Acidified Potassium Dichromate.


– 1º => Aldehyde => Carboxylic Acid.


– 2º => Ketone => No further oxidation.


– 3º => Doesn't Oxidise.

To go from an aldehyde to a carboxylic acid, or straight to a carboxylic acid:

We will heat the solution under reflux.

When alcohols are oxidised using acidified dichromate:



– Observation?

The observation we see is from orange to green (the Cr goes from +6 - +3).

To test between Aldehydes and Ketones:

Can use either Tollen's Reagent or Fehling's solution.

Tollen's reagent:




1) Complex?


2) Observation?

1) [Ag(NH3)2]+.


2) A silver mirror will form around the test tube.

Fehling's Solution:




1) Is?


2) Observation?

1) Blue coppeer (II) ions.


2) A brick red ppt will form.