Class 12 Aldehydes Ketones Carboxylic Acids Name Reactions & Conversions CBSE Notes
Table of Contents
Aldehydes, Ketones & Carboxylic Acids – Name Reactions & Conversions (Class 12 CBSE)
Aldehydes, Ketones and Carboxylic Acids is one of the most important and high-scoring chapters in Class 12 Organic Chemistry CBSE.
This chapter includes direct name reactions, conversions, and reasoning-based questions in board exams.
If you memorize name reactions and conversion pathways, you can easily score full marks in organic chemistry.
High Weightage Topics in This Chapter (CBSE)
These topics are frequently asked:
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Nucleophilic addition reactions
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Oxidation and reduction reactions
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Aldol condensation
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Cannizzaro reaction
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Haloform reaction
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Clemmensen and Wolff–Kishner reduction
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HVZ (Hell–Volhard–Zelinsky) reaction
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Important conversions (Alcohol → Aldehyde → Acid, etc.)
Tip: Name reactions and conversions carry direct marks.
Important Name Reactions (Must Revise for Boards)
1. Aldol Condensation
Aldehydes or ketones with α-hydrogen react in presence of base to form β-hydroxy aldehydes/ketones.
Example:
Acetaldehyde → Aldol → Crotonaldehyde (on dehydration)
2. Cannizzaro Reaction
Aldehydes without α-hydrogen undergo disproportionation in strong base.
Example:
2 HCHO → HCOOH + CH₃OH
3. Haloform Reaction
Methyl ketones or ethanol produce yellow precipitate of CHI₃ (iodoform).
Used to identify methyl ketones.
4. Clemmensen Reduction
Aldehydes/ketones → Alkanes
Reagent: Zn/Hg + HCl
5. Wolff–Kishner Reduction
Aldehydes/ketones → Alkanes
Reagent: Hydrazine (NH₂NH₂) + KOH + heat
6. HVZ Reaction (Hell–Volhard–Zelinsky)
Carboxylic acids with α-hydrogen undergo halogenation.
Reagent: Red P + Cl₂/Br₂
7. Rosenmund Reduction
Acid chloride → Aldehyde
Reagent: H₂/Pd–BaSO₄
Important Conversions for Class 12 Boards
Alcohol → Aldehyde → Carboxylic Acid
| Conversion | Reagent |
|---|---|
| Primary Alcohol → Aldehyde | PCC |
| Aldehyde → Carboxylic Acid | KMnO₄ / K₂Cr₂O₇ |
Aldehyde / Ketone → Alcohol
| Conversion | Reagent |
|---|---|
| Aldehyde → Primary Alcohol | NaBH₄ / LiAlH₄ |
| Ketone → Secondary Alcohol | NaBH₄ / LiAlH₄ |
Carboxylic Acid → Alcohol
| Conversion | Reagent |
|---|---|
| Carboxylic Acid → Alcohol | LiAlH₄ |
Acid Chloride → Aldehyde
| Conversion | Reagent |
|---|---|
| Acid Chloride → Aldehyde | Rosenmund Reduction |
Oxidation and Reduction Summary Table
| Compound | Oxidation Product | Reduction Product |
|---|---|---|
| Aldehyde | Carboxylic Acid | Primary Alcohol |
| Ketone | No oxidation (mild) | Secondary Alcohol |
| Carboxylic Acid | No oxidation | Primary Alcohol |
Easy-to-Score Topics in This Chapter
These topics are very scoring in CBSE exams:
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Name reactions and reagents
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Oxidation and reduction conversions
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Distinction tests (Fehling, Tollens, Iodoform)
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Aldehyde vs Ketone differences
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Mechanism of Aldol and Cannizzaro reactions
Memorizing reagents can give direct marks.
Exam Tips for Aldehydes, Ketones & Carboxylic Acids
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Learn all name reactions with reagents
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Practice conversion questions daily
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Write reagent names clearly in exams
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Draw reaction mechanisms where required
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Revise tests for aldehydes and ketones
Organic chemistry becomes very easy if reactions are memorized logically.
Conclusion
Aldehydes, Ketones and Carboxylic Acids is one of the most scoring chapters in Class 12 Chemistry CBSE. By learning name reactions, reagents, and conversions, students can easily solve board exam questions. Focus on Aldol, Cannizzaro, Haloform, and HVZ reactions for maximum marks.
Click here to read about Class 12 Chemical Kinetics Numericals CBSE | Important Formulas, Solved Problems & Exam Guide: https://dekhocampus.com/news/class-12-chemical-kinetics-numericals-cbse-2026
FAQs (Frequently Asked Questions)
Aldol condensation, Cannizzaro, Haloform, HVZ, Clemmensen, and Wolff–Kishner are most important.
Memorize reactions, practice conversions, and write reagents clearly in the exam.
Yes, this chapter is very high-weightage with direct reactions and conversions.
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