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Aldehydes, Ketones and Carboxylic Acids — Revision Notes

NEET-UG · Chemistry

Free Aldehydes, Ketones and Carboxylic Acids revision notes for NEET-UG Chemistry 2026 — key concepts, formulas, and definitions for quick revision.

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A reaction mechanism illustrating the Reformatsky reaction, where aldehydes or ketones react with α-bromo esters and zinc to form β-hydroxy esters, involving an organozinc intermediate.
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Revision Notes — Aldehydes, Ketones and Carboxylic Acids

Key concepts, formulas, and definitions from Aldehydes, Ketones and Carboxylic Acids for NEET-UG Chemistry preparation.

Key Topics to Revise

1

Structure and Physical Properties

  • Carbonyl carbon is sp² hybridized with trigonal planar geometry (120° bond angles)
  • C=O bond is polar due to electronegativity difference (δ+C=Oδ-)
  • Aldehydes and ketones have higher boiling points than hydrocarbons but lower than alcohols of similar molecular mass
2

Preparation Methods - Aldehydes

  • Oxidation of primary alcohols using PCC gives aldehydes (controlled oxidation)
  • K₂Cr₂O₇/H₂SO₄ can over-oxidize to carboxylic acids, so PCC is preferred
  • Rosenmund reduction: RCOCl + H₂ → RCHO + HCl (Pd-BaSO₄, quinoline)
3

Preparation Methods - Ketones

  • Oxidation of secondary alcohols: R₂CHOH → R₂CO (K₂Cr₂O₇/H₂SO₄ or PCC)
  • Friedel-Crafts acylation: ArH + RCOCl → ArCOR + HCl (AlCl₃)
  • Dry distillation of calcium salts: (RCOO)₂Ca → R₂CO + CaCO₃
4

Chemical Reactions - Aldehydes and Ketones

  • Nucleophilic addition reactions due to electrophilic carbonyl carbon
  • Addition of HCN forms cyanohydrins (important for chain extension)
  • Addition of NH₃ derivatives forms imines, oximes, hydrazones

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Key Concepts

The carbonyl group (C=O) isAldehydesAldehydes and ketones have higher boilingAldehydes and ketones undergo nucleophilic additionAldehydes are easily oxidized to carboxylic

Frequently Asked Questions

What topics are covered in Aldehydes, Ketones and Carboxylic Acids for NEET-UG?
Aldehydes, Ketones and Carboxylic Acids is an important chapter in NEET-UG Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Structure and Physical Properties, Preparation Methods - Aldehydes, Preparation Methods - Ketones, Chemical Reactions - Aldehydes and Ketones.
How important is Aldehydes, Ketones and Carboxylic Acids for NEET-UG?
Aldehydes, Ketones and Carboxylic Acids is a frequently tested chapter in NEET-UG Chemistry. Questions from this chapter appear regularly in previous year papers. There are 84 practice questions available for this chapter.
How to prepare Aldehydes, Ketones and Carboxylic Acids for NEET-UG?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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