Aldehydes Ketones and Carboxylic Notes Acids

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1. Board CBSE
2. Textbook NCERT
3. Class Class 12
4. Subject  Notes
5. Chapter Chapter 12
6. Chapter Name Aldehydes Ketones and Carboxylic Acids
7. Category CBSE Revision Notes

Aldehydes Ketones and Carboxylic Acids PDF

  • Aldehydes and Ketones.

  • Nomenclature.

  • Nature of carbonyl groups.

  • Physical and chemical properties.

  • Nucleophilic addition.

  • Carboxylic acids.

  • Preparation of carboxylic acids.

  • Properties and uses.

Revision Notes Class 12 Chemistry Chapter 12

Given below is a brief explanation of the important concepts in the chapter. For a detailed explanation of the same, refer to aldehydes, ketones, and carboxylic acids class 12 chemistry revision notes. revision notes class 12 chemistry chapter 12 contains a comprehensive explanation of all the topics and solutions of the questions.

  • Aldehydes and Ketones

Aldehydes and ketones are commonly named by adding an aldehyde or phenone to the compound name.

In IUPAC nomenclature, we substitute the -e with an -al and -one in the case of aldehyde and ketone respectively.

By oxidation of primary and secondary alcohols, we obtain aldehydes and ketones. Also, the dehydrogenation of alcohol gives us aldehyde and ketones. Also, we can obtain aldehyde and ketone on ozonolysis of alkenes and hydrolysis of alkynes.

  • Carboxylic Acids

Carboxylic acids are commonly named by adding the suffix -ic acid. In IUPAC nomenclature the -e is replaced by -oic acid.


  1. On oxidizing primary alcohols and aldehydes with common oxidizing agents such as potassium permanganate or potassium dichromate, we readily obtain carboxylic acids.


  1. On oxidation of alkylbenzenes and further hydrolysis of the intermediate formed, we obtain carboxylic acids.

  2. Nitriles are hydrolyzed to corresponding amides and on further reacting with H+ or OH we obtain carboxylic acids. Amides readily give carboxylic acids on hydrolysis.

  3. Grignard reagents on reacting with dry ice in the presence of ether give carboxylic acids salts which on hydrolysis gives us carboxylic acids

  4. Hydrolysis of esters in the presence of an acid readily gives carboxylic acids.

Aldehydes Ketones and Carboxylic Acids  Notes PDF – FAQs (Frequently Asked Questions)

1. How are Aldehydes Prepared?

Aldehydes can be prepared by any of the following reactions.

  • Rosenmund Reaction

From the hydrogenation of acid chloride with palladium and barium sulphate as catalysts we prepare aldehydes.

Benzoyl chloride ⟶ benzaldehyde (catalyst – H2, Pd-BaSO4)

  • Stephen Reaction

Nitriles reacting with stannous chloride in the presence of hydrochloric acid are reduced to imine, and its hydrolysis gives us aldehyde.

RCN + SnCl2 + HCl ⟶ RCH = NH ⟶ RCHO

  • Etard Reaction

Methylbenzene on reacting with chromyl chloride gives a chromium complex which on hydrolysis gives us the corresponding benzaldehyde.

Methyl benzene + CrO2Cl2 ⟶ Chromium complex ⟶ benzaldehyde

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