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CBSE - XII Science - Chemistry - Aldehydes, Ketones and Carboxylic Acids

methods of preparations of aldehydes n ketones???

Asked by seema behera 26th July 2012, 4:11 PM
Answered by Expert


Oxidising alcohols to make aldehydes and ketones

The oxidising agent used in these reactions is normally a solution of sodium or potassium dichromate(VI) acidified with dilute sulphuric acid. If oxidation occurs, the orange solution containing the dichromate(VI) ions is reduced to a green solution containing chromium(III) ions.

The net effect is that an oxygen atom from the oxidising agent removes a hydrogen from the -OH group of the alcohol and one from the carbon to which it is attached.

R and R' are alkyl groups or hydrogen. If at least one of these groups is a hydrogen atom, then you will get an aldehyde. If they are both alkyl groups then you get a ketone.

Answered by Expert 26th July 2012, 7:22 PM

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