Class 12 Chemistry Aldehydes Ketones Acids Methods of preparation

Methods of preparation

There are different methods for their preparation

  1. Common Methods for both aldehyde and ketones
  2. Preparation for Only aldehydes
  3. Preparation for Only Ketones

 

1. From alcohols

  1. Oxidation of alcohols: It is prepared from oxidation of alcohols using Oxidising agents  like K2Cr2O7 , Na2Cr2O7 , PCC , collins reagent (Cro3 + pyridine). All of them are good oxidising agents. So, we need to poison in order to stop it at aldehydic stage.

 Class_12_Aldehydes_&_Ketones_Preparation_From_Alcohols

           

 (From tertiary alcohol ) : We can’t get aldehyde from tertiary alcihols as there is no alpha hydrogen present. So ,in this case we get alkene.

  • If we have cyclohex – 2 ene –1ol

 Class_12_Aldehydes_&_Ketones_Preparation_From_Alcohols_1

             

b.Dehydrogenation of alcohols –  Cu (573k)

 Class_12_Aldehydes_&_Ketones_Dehydrogenation_Of_Alcohols

  1. FORM CARBOXYLIC ACIDS

 Class_12_Aldehydes_&_Ketones_Catalytic_Decomposition_Of_Alcohols

  • Distillation of calcium salts of acids

Class_12_Aldehydes_&_Ketones_Distillation_Of_Calcium_Salts

  • From hydrocarbons :
  • By acid hydration of alkynes

 Class_12_Aldehydes_&_Ketones_Acid_Hydration_Of_Alkynes

  •  Ozonolysis of alkenes

 Class_12_Aldehydes_&_Ketones_Onzonolysis_of_Alkenes

  •   From gem dihalide

Class_12_Aldehydes_&_Ketones_From_Gem_Dihalide

                                              

 

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