Download JEE Chemistry Concept Summaries: JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01
Review targeted revision notes for JEE Chemistry with the JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01. Built according to official educational guidelines for the 2026-27 academic year, these downloadable summaries for Aldehydes Ketones And Carboxylic Acids support daily study and last-minute exam readiness.
Access Aldehydes Ketones And Carboxylic Acids Notes and Study Material
View or download the dedicated Aldehydes Ketones And Carboxylic Acids revision resource below. Engaging with these structured concept notes daily ensures continuous academic progress and mastery of the 2026-27 curriculum for Chemistry.
Carbonyl Group and Preparation of Aldehydes and Ketones
In aldehydes and ketones the carbonyl carbon is sp2 hybridised and planar, and the C=O bond is polarised with the carbon partly positive. Aldehydes have at least one hydrogen on the carbonyl carbon; ketones have two carbon groups.
| Method | Product |
|---|---|
| Oxidation of primary alcohol (PCC) or dehydrogenation over Cu | aldehyde |
| Oxidation or dehydrogenation of secondary alcohol | ketone |
| Ozonolysis of alkenes | aldehydes and/or ketones |
| Hydration of alkynes (\( \ce{HgSO4} \), dil. \( \ce{H2SO4} \)) | ethyne gives acetaldehyde; other alkynes give ketones |
| Rosenmund reduction | acid chloride + \( \ce{H2} \), Pd-\( \ce{BaSO4} \) gives aldehyde |
| Stephen reduction | nitrile + \( \ce{SnCl2/HCl} \), then water gives aldehyde |
| DIBAL-H reduction | nitrile or ester gives aldehyde |
| Etard reaction | toluene + \( \ce{CrO2Cl2} \), then water gives benzaldehyde |
| Gattermann-Koch | benzene + CO + HCl, \( \ce{AlCl3} \)/\( \ce{CuCl} \) gives benzaldehyde |
| Friedel-Crafts acylation | arene + acid chloride, \( \ce{AlCl3} \) gives aryl ketone |
| Acid chloride + dialkylcadmium or Grignard + nitrile | ketone |
| Dry distillation of calcium salts | calcium acetate gives acetone; with calcium formate gives aldehyde |
Nucleophilic Addition Reactions
Aldehydes are more reactive than ketones because they have less steric hindrance and the carbon is more positive (only one alkyl group donating electrons). Aromatic aldehydes are less reactive than aliphatic ones because of resonance with the ring.
| Reagent | Product |
|---|---|
| HCN | cyanohydrin, hydrolysed to a 2-hydroxy acid |
| \( \ce{NaHSO3} \) | crystalline bisulphite adduct (aldehydes and methyl ketones) |
| Alcohol with dry HCl | acetal (aldehyde) or ketal |
| \( \ce{NH2OH} \) | oxime |
| \( \ce{NH2NH2} \) | hydrazone; with KOH/glycol gives alkane (Wolff-Kishner) |
| Phenylhydrazine, 2,4-DNP, semicarbazide | phenylhydrazone, yellow-orange DNP derivative, semicarbazone |
| Grignard reagent, then water | HCHO gives 1 degree, other aldehydes 2 degree, ketones 3 degree alcohol |
Reduction and Oxidation of Carbonyl Compounds
\( \ce{NaBH4} \) and \( \ce{LiAlH4} \) reduce C=O to alcohols (NaBH4 leaves esters and C=C untouched). Clemmensen reduction (\( \ce{Zn-Hg/HCl} \)) and Wolff-Kishner reduction (\( \ce{NH2NH2/KOH} \)) convert C=O to \( \ce{CH2} \). Catalytic hydrogenation reduces C=O and C=C both.
Aldehydes are easily oxidised even by mild reagents; ketones need strong oxidants and break up into acids with fewer carbons.
| Test | Aldehyde | Ketone |
|---|---|---|
| Tollens' reagent | silver mirror | no reaction |
| Fehling's solution | red \( \ce{Cu2O} \) (aliphatic aldehydes only) | no reaction |
| Schiff's reagent | pink colour | no colour |
| Iodoform (\( \ce{I2/NaOH} \)) | yellow \( \ce{CHI3} \) for acetaldehyde | yellow \( \ce{CHI3} \) for methyl ketones |
Aldol, Cannizzaro and Related Reactions
Aldol condensation: an aldehyde or ketone with at least one alpha hydrogen, in dilute alkali, forms an enolate that attacks the carbonyl carbon of another molecule. The beta-hydroxy product (aldol) loses water on heating to give an alpha,beta-unsaturated carbonyl compound. Acetaldehyde gives 3-hydroxybutanal and then crotonaldehyde; acetone gives diacetone alcohol and then mesityl oxide. Crossed aldol reactions give mixtures unless one partner has no alpha hydrogen.
Cannizzaro reaction: aldehydes without alpha hydrogen (HCHO, benzaldehyde) disproportionate in concentrated alkali into an alcohol and a carboxylate. In a crossed reaction between HCHO and another aldehyde, formaldehyde is oxidised to formate. An intramolecular Cannizzaro reaction occurs with phthalaldehyde.
Other name reactions: benzoin condensation (two benzaldehydes with cyanide), Perkin reaction (benzaldehyde with acetic anhydride, giving cinnamic acid), Claisen-Schmidt condensation (benzaldehyde with acetone or acetophenone) and the haloform reaction of methyl ketones.
Free study material for Chemistry
Aldehydes Ketones And Carboxylic Acids Concepts and Summary for JEE Chemistry
Quick Revision Notes: Aldehydes Ketones And Carboxylic Acids (JEE)
Access structured revision notes for Aldehydes Ketones And Carboxylic Acids designed in alignment with the latest JEE curriculum for JEE Chemistry. These summaries help clarify core themes and support effective daily study.
Expert Study Material for JEE Chemistry
Each chapter summary is structured around standard JEE textbooks, allowing students to check their understanding and clarify complex ideas early in their revision.
Complete Your Chapter Revision
Wrap up your chapter revision by testing your knowledge against standard question formats. Everything on our platform is provided free of charge.
FAQs
You can download the teacher prepared revision notes for JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01 from StudiesToday.com. These notes are designed as per 2026-27 academic session to help JEE students get the best study material for Chemistry.
Yes, our JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01 include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 JEE exams.
Yes, our JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01 provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of JEE syllabus in JEE is covered.
These notes for Chemistry are organized into bullet points and easy-to-read charts. By using JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01, JEE students fast revise formulas, key definitions before the exams.
No, all study resources on StudiesToday, including JEE Chemistry Aldehydes Ketones and Carboxylic Acids Notes Set 01, are available for immediate free download. JEE Chemistry study material is available in PDF and can be downloaded on mobile.