Ncert Solution Class 12 Chemistry Chapter 12 Questions And Answers, Notes & Numericals PDF

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Ncert Solution Class 12 Chemistry Chapter 12 Questions And Answers, Notes & Numericals PDF, Ncert Solution Class 12 Chemistry, Ncert Solution Class 12 Chemistry Chapter 12 Questions And Answers, Notes & Numericals PDF


Ncert Solution Class 12 Chemistry Chapter 12 Questions


Class12th 
Chapter No12
ProvidingQuestions And Answers, Notes & Numericals PDF
Chapter NameAldehydes, Ketones and Carboxylic Acids
BoardCBSE
Book NCERT
SubjectChemistry
Medium English
Study MaterialsFree VVI Study Materials are Available
Download PDF Ncert Solution Class 12 Chemistry Chapter 12 PDF

Aldehydes, Ketones and Carboxylic Acids


1. Carbonyl group (C=O) has been classified into two categories. aldehydes (RCHO) and ketones (RCOR). 

2. Aldehydes and ketones are functional isomers.

3. Aldehydes are prepared by

  • (a) dehydrogenation or controlled oxidation of primary alcohols,
  • (b) controlled reduction of acyl halides. 
  • (c) Aromatic aldehydes are prepared by oxidation of methyl benzene by Cro, or Cro₂Cl₂ in the presence of acetic anhydride.

4. Ketones are prepared by 

  • (a) oxidation of secondary alcohols.
  • (b) hydration of alkynes.
  • (c) the reaction of an acyl chloride with dialkyl cadmium.

5. Boiling points of aldehydes and ketones are less than that of alcohols of comparable molecular masses. 

6. Aldehydes can be distinguished from ketones by Tollen’s reagent. Fehling’s solution and Benedict’s solution.

7. Aldehydes and ketones with a-hydrogen undergo aldol condensation and without a-hydrogen undergo Cannizzaro’s reaction.

8. Reaction with 2,4-DNP can be used to identify the presence of a carbonyl group. 

9. Common name of hexamethylenetetramine is urotropine; it is a urinary antiseptic 

10. Benzoic acid has less acidic strength than formic acid.

11. Carboxylate ions have more acidic strength than phenoxide ions due to the delocalization of lone pairs of electrons over more electronegative two oxygen atoms.

12. Carboxylic acids are prepared by

  • (a) oxidation of primary alcohols, aldehydes and alkenes. 
  • (b) by hydrolysis of nitriles.
  • (c) by the treatment of Grignard reagents with carbon dioxide. 

13. Aromatic carboxylic acids are prepared by side chain oxidation of alkyl benzenes.

14. Carboxylic acids are reduced to alcohols with LIALH, or H₂ in the presence of copper chromite. 

15. Methanoic acid (Formic acid) is the only monocarboxylic acid that can be used as a reducing agent. 

16. COOH group in benzoic acid is meta-directing as well as deactivating in nature.

17. Formalin is (40%) aqueous solution of formaldehyde that is used to preserve biological specimens. 

18. Benzoic acid is used as a food preservative.


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