Class 12 Chemistry Aldehydes Ketones Acids Chemical properties of Aldehydes and Ketones
  • Reduction of Aldehyde and Ketone

       The major product on reduction is alcohol.

  • Aldehyde gives primary alcohol.
  • Ketones give secondary alcohol.

Major Oxidising agents can be used like Ni , Pt , LiALH4, NaBH4 etc. Out of them , LiALH4is the strongest one .The reaction that occurs is given below:

Class_12_Aldehydes_&_Ketones_Reduction_Of_Aldehydes_&_Ketones

  • Reduction to HC’s
  •  Clemenson reduction – In this ,we take aldehyde and use Zinc in presence of HCl or Zn / Hg amalgam in HCl. The reaction involved is:

         Class_12_Aldehydes_&_Ketones_Clemenson_Reduction

  • Wolf kishner reduction: In this aldehyde is reacted with hydrazine as shown below :

          Class_12_Aldehydes_&_Ketones_Wolf_Kishner_Reaction

  • For aromatic ketones

        Class_12_Aldehydes_&_Ketones_Wolf_Kishner_Reaction_1 

 

  • By action of red phosphorous on HI we get, hydrocarbons [ temperature 423 – 473k] as shown below:

        Class_12_Aldehydes_&_Ketones_Wolf_Kishner_Reaction_2

  • Reduction to Pinacol – For this ,we take 2 moles of acetone and reduce them as shown:

.Class_12_Aldehydes_&_Ketones_Reduction_To_Pinacol

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process


.